exam Maths Puzzle Numerical Ability

I also wanted to thank everyone that has helped me with my many problems, I am so bad with math. I also want to thank the ones that explain how things are done or how you "come up"

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exam Other Question

Solve the system by substitution.
x + 4y = -4
3x - 3y = -12
Simplify:
(7x^2+3x-9)-(-x^2+8x-3)