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Home > AC > Chapter 6 > Lesson 6.2.1 > Problem 6-40

6-40.

Kevin and his little sister, Katy, are trying to solve the system of equations shown below. Kevin thinks the new equation should be , while Katy thinks it should be . Who is correct and why? 

In order to solve the system of equations must be substituted in for .

Katy is right.