book Maths Puzzle Numerical Ability

what is the answer to y=3x+3
3x+2y=-12
I tried to figure it out and got an answer can you tell me if its right

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book Other Question

Find the midpoint of the line segment from A(2-,9) to B(4,5). Factor completely: 6z^3-27z^2+12z

Is it 3z(2z-1)(z-4)?