3x – y = 7 6x – y = 10 When solving this system of equations by elimination, which could be the resulting equation when a vari

Question

3x – y = 7
6x – y = 10
When solving this system of equations by elimination, which could be the resulting equation when a variable has been eliminated?
A) 9x – 2y = 17
B) -3y = 24
C) -3x = -3
D) 9x = 17

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Answers ( No )

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    2021-09-10T09:19:08+00:00

    3x – y = 7
    6x – y = 10

    if you subtract the second equation from the first to eliminate y you get:
    3x-y-(6x-y)=7-10
    3x-y-6x+y=-3
    -3x=-3

    so option C) -3x=-3 is the solution

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