book Maths Puzzle Numerical Ability

simplify:

6 over 2x-12 minus 20 over x^2-4x-12

Please explain in detail so I understand Thanks.

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book Other Question

In all equations of graphs the equation is y=mx+b. Being that "m" is equal to the slope and "b" representing the y-interscept. My question is why do they use those specific letters for the equation? Having trouble with this.

5. Suppose you travel north for 65 kilometers then travel east 75 kilometers. How far are you from your starting point?
Answer:
Show work in this space.