# 3 Variables

### How To : Solve 3 equations with 3 variables

You can solve 3 equations having 3 variables. Here are the 3 equation examples: x+2y+z=10. 2x-y+3z=-5. 2x-3y-5z=27. The goal is to reduce to 2 equations having 2 variables. Multiply bottom equation by (-1). Rewrite 2nd and 3rd equation. 2x-y+3z=-5. Add -2x+3y+5z+-27. Equals 2y ...more

### How To : Set environment variables in Windows XP

This video shows you how to set environment variables in Windows XP. A lot of the older software written for windows requires the use of environment variables. There are variables set at the system level and programs that run in a DOS window or older programs can access these ...more

### Hack Like a Pro : Linux Basics for the Aspiring Hacker, Part 9 (Managing Environmental Variables)

Welcome back, my aspiring hackers! One of the areas that often gives Linux newcomers problems are the environment variables. Although Windows systems have environment variables, most users, and for that matter, most administrators, never manage their environment variables. To ...more

### How To : Security-Oriented C Tutorial 0x02 - Variables && Data Types

Hello again, reader! In this post, we are going to cover some data types and how to declare variables. It shouldn't be too hard so just sit back, relax, grab some popcorn and enjoy the ride (while you still can!). What Is a Variable? For those who do not know, a variable is ...more

### How To : Program variables in the Lego Mindstorms NXT system

Using variables allows your Lego Mindstorms NXT robot to store numbers or text based on input. Learn how to program variables using the NXT programming environment. Program variables in the Lego Mindstorms NXT system. Click through to watch this video on ortop.org

### How To : Set attributes and local variables in Houdini 10

This clip offers an introduction to using attributes and local variables in Houdini. It covers vertices (vertexes), points, primitives and details. Whether you're new to Side Effects Software's popular 3D production program or a seasoned graphic artist just interested in bette ...more

### How To : Graph and solve linear inequalities in two variables

From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next ...more

### How To : Simplify a radical expression including variables

Want to simplify a radical expression with algebraic variables? See how it's done with this free video algebra lesson. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks t ...more

### How to Program in C# : Variables and Data Types (Part 2)

Welcome back my friends !! Today we'll go through the second part of this C# series Let's start!! Last time we left off with Console.WriteLine and Console.ReadKey now we'll combine these with some variables and comments. Comments are useful for multiple reasons: for exemple ...more

### How to Train Your Python : Part 2, Basic Output, Variables, and Types

In python, or any scripting language for that matter, there are certain things that you will carry with you throughout your entire scripting career. Some of the most basic things that you will keep with you are output, variables, and their value types. We'll start by going ove ...more

### How To : Use variables when writing a program in Java

Java works a little differently than languages like Python or PHP when it comes to working with variables. This tutorial shows you what the difference is, how you can define your variables and the easiest ways to work with them when writing programs in Java.

### How To : Use variables when programming with the Python language

Variables are the core of nearly any programming language, and Python is no different. This tutorial shows you how to work with variables when you're starting to program in Python. This also shows you how to get familiar with the shell in Python.

### How To : Solve inequalities with mixed and negative variables

Not all inequalities are created equal. See how to solve three of the most common types with this free video algebra lesson, which discusses regular, negative and mixed-variable inequalities. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and ...more

### How To : Solve equations with algebraic variables on both sides

In basic algebraic equations all the variables are on left side of the equation. But as the complexity of the problems increases you will find that the equations will contain variables on both sides of the equation. To solve these kinds of problems first simplify the equations ...more

### How To : Multiply variables with rational exponents in algebra

Looking for a primer on how to multiply varibles with rational exponents? Look no further. This free video algebra lesson will show you how it's done. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belong ...more

### How To : Encrypt batch files with variables

Encryption is the process of converting you data in to other obscure form so that no one can read it. Encryption can also be done using batch files. Batch files are scripting programs in windows which can be used to program small automatic operations. To do this open a notepad ...more

### How To : Multiply variables

An educational video from Math Problem Generator that shows how to multiply variables. It is a very short video - about 1 min in length. This video is really for kids who have just started their algebraic variable classes. This video takes two variables of x along with their ...more

### How To : Add and subtract variables

Math Problem Generator gives a video about how to add and subtract variables. All you have to do is combine the coefficient, which is the number that comes before the variable. The numbers are added or subtracted but the variable remains the same. In the video, the example giv ...more

### How To : Program variables in Python

Bucky from The New Boston serves up this Python video tutorial on how to program variables in Python. This is the program you use to write all of your Python code down. Fun with variables! Python is a dynamic, object-oriented, high-level, programming language that can be used ...more

### News : Learn to Code in Python, Part One: Variables, Input and Output

In this article, I'll be exploring the basics of Python, i.e. variables, input and output. You'll need Python (2.7+), a computer, and some free time. Variables Simply put, variables are like envelopes. They are empty and meaningless until we place objects and meaning into th ...more

### How To : Use variables and strings when programming in Python 2

In this clip, you'll learn the ins and outs of using variables and strings when writing code in Python 2. Whether you're new to the Python Software Foundation's popular general purpose programming language or a seasoned developer looking to better acquaint yourself with the fe ...more

### How To : Work with continuous random variables in calculus

Looking for a primer on how to work with BRIEF probability density functions and continuous random variables in calculus? Learn how with this free video calc lesson. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical mi ...more

### How To : Use post, get and request superglobal variables in PHP programming

This tutorial provides some more useful information for PHP beginners. You'll get a quick overview about post, get and request superglobal variables. From this you'll learn how to handle a URL and a form. Don't be shy, jump in and see if PHP is right for you.

### How To : Find the variance of differences of random variables in statistics

From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. For all of the details, watch this installment from ...more

### How To : Graph linear inequalities in two variables in algebra

From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this installment from Internet pedagogical sup ...more

### How To : Solve an algebraic expression with given variables

Need help figuring out how to solve an equation with given variables in algebra? Learn how with this free video math lesson. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, th ...more

### How To : Simplify fractions with variables in basic algebra

Need help reducing fractions containing algebraic variables? Learn how with this free video lesson. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it' ...more

### How To : Create a scatter diagram for 2 variables in Excel

If you use Microsoft Excel on a regular basis, odds are you work with numbers. Put those numbers to work. Statistical analysis allows you to find patterns, trends and probabilities within your data. In this MS Excel tutorial from everyone's favorite Excel guru, YouTube's Excel ...more

### How To : Find global expression variables in Houdini

Learn how to find all your global expression variables within Houdini.

### How To : Perl for the Aspiring Hacker - Part 1 - Variables

Before I start a series on remote exploitation, I think we should learn the basics of Perl. Perl, Ruby, C, C++, Cython and more are languages that some penetration testers just need to learn. Perl is a great language for multiple things, sadly, like many other scripting langua ...more

### How To : Use instance variables and multiple methods for Java

Want to program your own Java games and applications but don't know beans about object-oriented programming? Never you fear. This free video tutorial from TheNewBostonian will have you coding your own Java apps in no time flat. Specifically, this lesson discusses how to multip ...more

### How To : Solve multi-step equations with variables on both sides

This video is aimed at beginner level viewers and shows one of the basic techniques involved while solving linear equations having one variable. This method finds it use when the variables and constants are present on both sides of the linear equation to be solved. As shown ...more

### How To : Simplify complex fractions with variables

In order to simplify complex variables, you must first consider the numerical values separate from the variable. In the case of 24x/48x, you would look at the numbers alone to see if they have any factors. These numbers have the number 6 in common. So, divide it by 6. This wil ...more

### How To : Divide variables

This is a helpful video provided by Math Problem Generator. It deals with the complex challenges of dividing variables. The audio is great and provides specific examples of dealing with multiple types of this problem. The video lays out three simple steps. The first being to s ...more

### How To : Overwrite variables on a subclass in Python

Bucky from The New Boston serves up this Python video tutorial on how to overwrite variables on a subclass in Python. This is the program you use to write all of your Python code down. Fun with subclasses! Python is a dynamic, object-oriented, high-level, programming language ...more

### Batch Basics : Understanding the Windows Command Line, Part 1 (Echo and Variables)

Welcome back, everyone! In this lesson, I'm going to go over the use of the echo function and variables, as well as basic syntax. You will need: A text editor - I personally recommend the free (and amazing) Notepad ++, but you can use any text editor you want, even Windows' ...more

### How To : Factor trinomials with 2 variables & GCF by grouping

In the video, the process of factoring trinomials is described. A trinomial that cannot be easily factored in its original form is shown. It is simplified by pulling out the greatest common factor. After that, a trinomial that is easier to factor is shown. Next, the simplified ...more

### How To : Solve equations with variables on both sides

Confused in math class and need some extra help? This educational video gives instruction on how to solve mathematical algebraic equations. It shows you how to break an equation down and make them less scary to solve. Step-by-step instructions show you how to solve more compli ...more

### How To : Evaluate fractions containing variables

This video is a great one on learning about evaluating fractions. The voice explains how to first plug in the numbers given for each variable in the fractions. He also explains the importance of simplifying the top and bottom first before simplifying the entire fraction. He al ...more

### How To : Security-Oriented C Tutorial 0x12 - Scope

What's up readers? We have ever so slightly touched upon this concept of scope with variables but still don't really know what it means. In this tutorial we will learn the behaviors of variables existing in our programs and within functions. What Is a Variable Scope? A scope ...more

### How to Java : E2 (DataTypes and TypeCasting)

Welcome back Java programmers! In this tutorial we'll being going over Variables/DataTypes and Type-casting So What Are Java DataTypes? Like in many other programming languages, you have variable types. Such as ints, doubles, chars, etc. They are used to instantiate the kind ...more

### How To : Massage data in Houdini 10

Get a crash course on HScript Expressions, Variables, and Attributes in Houdini 10. If you don't even know what this means, then you probably need to check this video tutorial series out. Understanding how to massage data in Houdini is key to giving yourself the creative edge ...more

### How To : Combine like terms

In order to combine like terms, you need to look at the variables. Terms can only be combined if the variables are all identical. The first thing that you would have to do is look for matching variables. In the example, x + 2x5 + y2 - 9x - 2x5 + 5y2, you should try to see whic ...more

### How To : Work with exponential growth functions in mathematics

Exponential functions are functions which contains terms which are integers raised to the power of variables. Note that the variables are not raised to the power of integers, but the integers are raised to the power of variables. Variables raised to the power of integers are c ...more

### How To : Security-Oriented C Tutorial 0x10 - Pointers and Addresses

In previous tutorials we have encountered these things called pointers and addresses but we still don't know what they really are. Let's learn a bit more to clear things up. What Are Pointers and Addresses? A pointer is a type of variable which as been combined with the dere ...more

### How To : Security-Oriented C Tutorial 0x0E - Functions Part II: Memory

In the last tutorial, we learned how to make functions and how they work on the high level. This time, we will take a peek under the hood again, stare deep into its soul and see its ugliness face to face to see how it works in the lower level. The Code Segment The code segme ...more

### How To : Generate Private Encryption Keys with the Diffie-Hellman Key Exchange

When we are building programs that communicate over a network, how can we keep our data private? The last thing we want is some other lousy hacker sniffing our packets, so how do we stop them? The easy answer: encryption. However, this is a very wide-ranging answer. Today we'r ...more

### Hack Like a Pro : Scripting for the Aspiring Hacker, Part 1 (BASH Basics)

Welcome back, my greenhorn hackers! Recently, I asked the Null Byte community what subject they would most like me to cover in future tutorials. Many of you cited scripting, and I decided it's best to cover this subject soon, so here goes. Any self-respecting hacker must be ...more

### Deadlier When Hot : These Infections Are Likely to Get Worse as the Climate Changes

When the climate changes, so do all the things that rely on the climate, including people, plants, and pathogens. A European study recently took a broad look at what kind of microorganisms are most likely to be affected as climate change heats, cools, dries, and wets the world ...more

### How To : Security-Oriented C Tutorial 0x0F - Functions Part III: The Stack

Welcome back to another tutorial on functions. Last time, we looked inside memory to see what functions looked like in the flesh and all that Assembly was pretty nasty. At least you have some exposure to it. This time, we will be examining how functions work with the stack. E ...more

### How To : A Hacker's Guide to Programming Microcontrollers

While hackers know and love the Raspberry Pi, many don't know of its cheaper cousin, the microcontroller. Unlike a Pi, which can be used more or less like a regular computer, microcontrollers like the Wi-Fi connected ESP8266 require some necessary programming skill to master. ...more

### How To : Communicate between Flash AS3 and PHP

All the files you need are in a free download on DevelopPHP. PHP has to be on a server. It will not run on a local machine. Type your name. There are two variables which show up in the dialog boxes (which are stacked.) You can change the user name. It sets up a URL request and ...more

### How To : Simplify radical expressions

In this video the instructor shows who to simplify radicals. If you have a term inside a square root the first thing you need to do is try to factorize it. First factorize the numerical term. Write down the numerical terms as a product of any perfect squares. Now split the ori ...more

### How To : Security-Oriented C Tutorial 0x19 - Functions Part V: Passing by Reference

Hello there! This will probably be the final tutorial on functions where we will be looking over a method called pass by reference. This technique allows us to modify large amounts of data without the overhead and return multiple values. Let's go! Passing by Value Until now, ...more

### How To : Properly Submit Tools for the Null Byte Suite

Hello everyone. I've recently made the annoucement of the Null Byte suite of tools, and we've covered how to download and install it. Now it's time we cover how to submit a tool for inclusion into the suite. It's relatively simple, but we need to get a few ground rules out of ...more

### HIOB : The Ruby Programming Language, Part 1: (Building an FTP Cracker)

Hello my fellow hackers, Welcome to my republished revision of the ruby programming language, Part 1. Today, we will try to build an ftp cracker in ruby: This is going to be a quick one since OTW has already made one in python and we are gonna look upon that to create a simil ...more

### Exploit Development : How to Defeat a Non-Executable Stack with ret2libc

After a long hiatus, we shall once again emerge from the shadowy depths of the internet to build an exploit. This time, we'll be looking at how to defeat a non-executable stack by using the ret2libc technique — a lean, mean, and brilliant way of exploiting a stack overflow vul ...more

### How To : Security-Oriented C Tutorial 0x08 - A Trip Down Memory Lane

Before I continue with a topic on strings, we first require some fundamental understanding of how memory works, i.e. what it is, how data looks in memory, etc. as this is crucial when we are analyzing vulnerabilities and exploitation. I highly suggest that your mind is clear a ...more

### Hack Like a Pro : Metasploit for the Aspiring Hacker, Part 2 (Keywords)

Welcome back, my rookie hackers! I recently began a series on using Metasploit, and my goal with it is to teach you the very basics the incredibly powerful hacking tool has to offer while progressively moving on to the more advanced features. In my first Metasploit installme ...more

### Advanced Exploitation : How to Find & Write a Buffer Overflow Exploit for a Network Service

While our time with the Protostar VM from Exploit Exercises was lovely, we must move on to bigger things and harder challenges. Exploit Exercises' Fusion VM offers some more challenging binary exploitation levels for us to tackle. The biggest change is that these levels are al ...more

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