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 05:55, May 30, 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. . 30 May 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 30 May 2017]
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Cynthia Kirkeby, “What Are Variables?.” ClassBrain Math Tutorials, http://www.classbrainmath.com/introduction-to-equations-defining-variables/ [accessed May 30, 2017].
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Cynthia Kirkeby, What Are Variables? [Internet]. ClassBrain Math Tutorials; 2013 March 2, 10:46 UTC [cited 2017 May 30]. 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 May. 30, 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 May 30, 2017.