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

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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