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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- Cynthia Kirkeby, “What Are 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 16 July 2018] - The Chicago Manual of Style
- Cynthia Kirkeby, “What Are Variables?.”
*ClassBrain Math Tutorials*, http://www.classbrainmath.com/introduction-to-equations-defining-variables/ [accessed July 16, 2018]. - CBE/CSE style
- Cynthia Kirkeby, What Are Variables? [Internet]. ClassBrain Math Tutorials; 2013 March 2, 10:46 UTC [cited 2018 Jul 16]. Available from: http://www.classbrainmath.com/introduction-to-equations-defining-variables/.
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- 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 July 16, 2018.