exam Maths Puzzle Numerical Ability

I need some help please:

Find the slope of any line perpendicular to the line through points (6, 3) and (7, 7). thank you

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exam Other Question

Find the distance between the two points given. Round to the nearest tenth, if necessary.

(1,1) and (3,2) If Eric had nineteen fewer nickels and twenty-one fewer dimes, he would have the same number of nickels, dimes, and quarters. Eric has a total of $7.45. How many of each coin does he have?