exam Maths Puzzle Numerical Ability

I need help trying to solve this problem..you are trying to find the slope.
(1/12, 1/8) (3/7, 9/17)..THANKS!

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exam Other Question
Consider the problem:

(x-8)/ (x-5 ) divided by (x-9)/ (x+4)



Explain why -5, 9, and -4 are not allowable replacements for the variable x. I am trying to factor the following equation -0.08p^2+300p, can you help me?