Since both equations are equal to y you can just make them equal to each other, like this 3x + 7 = x - 9. From there isolate the varible x on one side so that the solution will be on the other side of the equation. I'll do the steps too for you.
3x + 7 = x - 9
2x + 7 = -9
2x = -16
x = -8
Hope this helps :)
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C should be your answer if I'm not right then forgive me please.
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Answer:
the answer of your question is 0
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the answer is 0
It think the answer would be and 9 and 5