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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.

Mathematics
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If you're having trouble with a problem like this I'd try a process of elimination. Try the methods outlined in all 3 answers
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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Other answers:

The correct answer is C, but you should try to figure out why.

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