Variables are used throughout Algebra, Geometry, and Calculus. They are the basic building blocks. Variables are therefore very important to understand.

A variable is a symbol, such as x, that is used to describe an unknown number. In functions variables often represent not one number, but many different numbers. Understanding variables is essential for you to understanding problems that will need to be graphed.

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What Are Variables?. (2013, March 2). In ClassBrain Math Tutorials. Retrieved 15:36, March 25, 2017, from
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Cynthia Kirkeby, What Are Variables?. ClassBrain Math Tutorials. March 2, 2013, 10:46 UTC. Available at: Accessed March 25, 2017.