Today your child learns the second way to solve for 2 unknowns in 2 independent equations. This is called Elimination by Comparison and basically what you do is manipulate each equation until you have one variable equaling a bunch of stuff that includes the second variable for both equations. Then you set the “bunch of stuff plus the second variable” side of both equations equal to each other. The basic idea is if a=n and a=p then n and p are equal.

DoodleCat walks your child through an example and then he gets two problems to try on his own.

Download Lesson 120 of Doodles Do Algebra HERE

Answers:

1. x=2 and y=3

2. x=-36 and y=-40

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