exam Maths Puzzle Numerical Ability

Find the slope of any line perpendicular to the line through points (9, 12) and (10, 4).
I got -8 but I am not sure if it is right.

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exam Other Question

3(x+2)-5=2x+7 A man can construct a wall in 20 hrs. With the help of his apprentice assistant the task would take 12 hrs. How long would it take the apprentice, working alone, to construct the wall?