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### Variable (mathematics) - Wikipedia, the free encyclopedia

In mathematics, a variable is a value that may change within the scope of a given problem or set of operations. In contrast, a constant is a value that remains unchanged, though often unknown or undetermined.The concepts of constants and variables are fundamental to many areas of mathematics and its applications. A "constant" in this context should not be confused with a mathematical constant which is a specific number independent of the scope of the given problem.

### Variables Expressions and Equations - YouTube

Introduction and examples of variables, expressions and equations

### Variables, Expressions and Equations Study Guide | Education.com

This lesson will break down the basic algebra group of variables, expressions, and equations.

Algebra is a type of math that uses variables to represent values. If numbers were secret agents, variables would be the disguises they wear. In algebra, you can use a letter to represent a number. And if you come across a variable, you can find its real identity by using any clues you find. In algebra, letters, called variables, are often used to stand in for numbers. Variables are usually written in italics. The z in z + 21 = 8 is a variable.

Any letter can be used to represent a number in an algebraic expression. The letters x, y, and z are commonly used.

### SparkNotes: Expressions and Equations: Variables

A summary of Variables in 's Expressions and Equations. Learn exactly what happened in this chapter, scene, or section of Expressions and Equations and what it means. Perfect for acing essays, tests, and quizzes, as well as for writing lesson plans.

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