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 16:03, September 23, 2018, 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 Sep 2018 <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 September 2018]
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Cynthia Kirkeby, “What Are Variables?.” ClassBrain Math Tutorials, http://www.classbrainmath.com/introduction-to-equations-defining-variables/ [accessed September 23, 2018].
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Cynthia Kirkeby, What Are Variables? [Internet]. ClassBrain Math Tutorials; 2013 March 2, 10:46 UTC [cited 2018 Sep 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 Sep. 23, 2018).
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 September 23, 2018.