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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*ClassBrain Math Tutorials*. Retrieved 08:10, February 18, 2018, from http://www.classbrainmath.com/introduction-to-equations-defining-variables/ - MLA style
- Cynthia Kirkeby, “What Are Variables?.”
*ClassBrain Math Tutorials*. 2 March 2013, 10:46 UTC. . 18 Feb 2018 <http://www.classbrainmath.com/introduction-to-equations-defining-variables/>. - MHRA style
- Cynthia Kirkeby, 'What Are Variables?',
*ClassBrain Math Tutorials*, 2 March 2013, 10:46 UTC, <http://www.classbrainmath.com/introduction-to-equations-defining-variables/> [accessed 18 February 2018] - The Chicago Manual of Style
- Cynthia Kirkeby, “What Are Variables?.”
*ClassBrain Math Tutorials*, http://www.classbrainmath.com/introduction-to-equations-defining-variables/ [accessed February 18, 2018]. - CBE/CSE style
- Cynthia Kirkeby, What Are Variables? [Internet]. ClassBrain Math Tutorials; 2013 March 2, 10:46 UTC [cited 2018 Feb 18]. 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 Feb. 18, 2018).
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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 February 18, 2018.