book Maths Puzzle Numerical Ability

find the slope of the line

-Ax + By = -C

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book Other Question

My book says that the solution of this problem:

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



is (-x^2) , but no matter what I do, I can only find x^2.
Help. Thank you.
Write 0.8(with a line over the 8) as a fraction in lowest terms. How do I do this? Thank you.