Video lesson: Solving a system of equations with the TI-84+

When you are given multiple equations and multiple variables, a graphing calculator can be a lifesaver.  New versions of the TI-84+ come with a pre-installed app the makes these problems a snap.  This video lesson covers solving systems equations by the elimination, or linear combination method, before covering how to use the TI-84 plus to solve.


The lesson does require you to have the PLYSMT2 app installed on your TI-84.  If you don’t have that app, you can download it free from the TI website.  We’ll have a tutorial on how to install apps soon.

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Lucas Allen

Lucas Allen

For more than a decade, Lucas Allen was a high school math teacher and math team coach in Illinois. His 2012 Morton High School math team won the Illinois state championship. Recently, he made the jump from public education to the corporate world and is now working as a data scientist. He is interested in just about all forms of technology, including the TI-Nspire, Nexus devices, R, MOOCs, and more. You can follow , and if you are nice, he will probably follow you back.

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