book Maths Puzzle Numerical Ability

I have no clue how to do this problem, so can you do it and then i can see how you got the answer? x2-y2/(x-y)2 x 1/x+y

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book Other Question

what is the anwser to this equation ?

3x-2=-5 I need to know if I have this question right or not, In the ordered pair(12,-7) ? Is the the abscissa 12 and the ordinate -7? Please tell me if I am right or not, please.