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 05:48, November 23, 2017, from http://www.classbrainmath.com/introduction-to-equations-defining-variables/
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Cynthia Kirkeby, “What Are Variables?.” ClassBrain Math Tutorials. 2 March 2013, 10:46 UTC. . 23 Nov 2017 <http://www.classbrainmath.com/introduction-to-equations-defining-variables/>.
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Cynthia Kirkeby, 'What Are Variables?', ClassBrain Math Tutorials, 2 March 2013, 10:46 UTC, <http://www.classbrainmath.com/introduction-to-equations-defining-variables/> [accessed 23 November 2017]
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Cynthia Kirkeby, “What Are Variables?.” ClassBrain Math Tutorials, http://www.classbrainmath.com/introduction-to-equations-defining-variables/ [accessed November 23, 2017].
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Cynthia Kirkeby, What Are Variables? [Internet]. ClassBrain Math Tutorials; 2013 March 2, 10:46 UTC [cited 2017 Nov 23]. Available from: http://www.classbrainmath.com/introduction-to-equations-defining-variables/.
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What Are Variables?, http://www.classbrainmath.com/introduction-to-equations-defining-variables/ (last visited Nov. 23, 2017).
AMA style
Cynthia Kirkeby, What Are Variables?. ClassBrain Math Tutorials. March 2, 2013, 10:46 UTC. Available at: http://www.classbrainmath.com/introduction-to-equations-defining-variables/. Accessed November 23, 2017.