5x + 2y = 8
x + y = 4
If you want to solve the system of equations by addition, which of the following could you do?
a)Multiply the second equation by 5 and add.
b)Multiply the second equation by 2 and add.
c)Multiply the second equation by -2 and add.

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to see which one would make a variable drop out thus allowing you to solve for the other variable

In this case, one of those methods will make the y-terms in the 2 equations add to 0

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