# Substitute

Pronunciation: /ˈsʌb.stɪˌtjut/ Explain

To substitute is to replace a variable or expression with another variable or expression that may be equal to the original variable or expression. For example, start with the equation y = x + 4. Substitute -3 for x. This gives y = -3 + 4. Now simplify the equation, giving y = 1. One can the conclude that when x = -3, y = 1 and that (-3, 1) is a solution to the original equation y = x + 4.

1. McAdams, David E.. All Math Words Dictionary, substitute. 2nd Classroom edition 20150108-4799968. pg 172. Life is a Story Problem LLC. January 8, 2015. Buy the book

• McAdams, David E.. Substitution Property of Equality. allmathwords.org. All Math Words Encyclopedia. Life is a Story Problem LLC. 3/12/2009. https://www.allmathwords.org/en/s/substitutionpropofequality.html.

McAdams, David E. Substitute. 5/7/2019. All Math Words Encyclopedia. Life is a Story Problem LLC. https://www.allmathwords.org/en/s/substitute.html.

### Revision History

5/7/2019: Changed equations and expressions to new format. (McAdams, David E.)
12/21/2018: Reviewed and corrected IPA pronunication. (McAdams, David E.)