I need a step-by-step process on how to do:

-3x+y=9
y=x-7

I would think this is a substitution problem.

Question

I need a step-by-step process on how to do:   -3x+y=9  y=x-7   I would think this is a substitution problem.

Acacia · Answer

Answer:   x = -8  y = -15   Step-by-step explanation:   -3x + y = 9  y = x - 7    -3x + x - 7 = 9  -2x - 7 = 9  -2x = 16  2x = -16  x = -8    y = -8 - 7  y = -15

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