Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

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Solving a Linear System in Three Variables with a Solution - Problem 3

Alissa Fong
Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

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The easiest way to start substitution is to find a variable that has a coefficient of one. Get that variable isolated in one equation, and substitute the resulting expression into both other equations. You will need to be extremely precise with +, - signs and distributing, but if done correctly, you can use this substitution to turn a 3 x 3 system into a much more approachable 2 x 2 system.

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