Khan Academy

Supporting grades: 8

Description: Given a 2-variable equation and the x or y values of a solution, Sal finds the value of the other variable in the solution. And they give us the equation, and then they want us to figure out, what does y equal when x is equal to negative five? And to figure this out, I've actually copied and pasted this part of the problem onto my scratchpad, so let me get that out. Actually, let me do it the second way, first.

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