deja2798 deja2798

13-02-2018
Mathematics

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In order to solve the following system of equations by subtraction, which of the following could you do before subtracting the equations so that one variable will be eliminated when you subtract them? 4x-2y=7 3x-3y=15
A.multiply the top equation by -3 and the bottom equation by 2 B.multiply the top equation by 1/3 C.multiply the top equation by 15 and the bottom equation by 7 D.multiply the top equation by 3 and the bottom equation by 4

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musiclover10045 musiclover10045

13-02-2018

A.multiply the top equation by -3 and the bottom equation by 2

by doing that the -2y in the top equation becomes 6y

and the -3y in the bottom equation becomes -6y

6y-6y = 0 so the Y is eliminated

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