book Maths Puzzle Numerical Ability

add and simplify

y over y^2-49 + 7 over y^2+8+7

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book Other Question

This math question has confused me. I know how to multiply exponents, but I am confused with the fact that this is negative. Can you please help me by showing me step by step. {1,2},{4,3} Find the slope of the line passing through each pair of points