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

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

step-by-step explanation:

the multiplicative inverse of a fraction a/b is b/a. for the multiplicative inverse of a real number, divide 1 by the number. for example, the reciprocal of 5 is one fifth 1/5 or 0.2, and the reciprocal of 0.25 is 1 divided by 0.25, or 4.

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step-by-step explanation:

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