exam Maths Puzzle Numerical Ability

simplify by combining like terms

7xysquared-7x-x+xysquared

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exam Other Question

Solve the following systems by graphing:

2x-3y = 12
-2x+y -8

I finished the problem and then checked my answer in the back of the book. I got the first one correct but cannot figure out the second part.
q^2-4/q^2-4+4