book Maths Puzzle Numerical Ability

i need help on solving this:-2x+3y=-14
2x+2y=4 solve for x and y

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book Other Question

Evaluate the function for the value specified - you need to arrive at a final numerical answer for each part. f(x) = x2 - 7x + 10
Find:
a) f (0)

b) f (5

c) f (-2)
My book says that:

[ (x^2 - y^2) / (4x + 4y) ] / [ (3y - 3x) / (12x^2) ]

But no matter what I do, I can only find x^2.
Help. Thank you.