You want to using the slope equation y2-y1 over x2-x1. So you want to subtract 0 from 5 and 6 from 2. Your answer would be 5/4
The answer I got is (3,6, -1)
Maybe you need to distribute it. -8y + 8
The ratio of heights = ratio of the square roots of the areas because area is 2 dimensional and height is one dimensional.
so required ratio is sqrt 40pi : = sqrt40:sqrt80 = sqrt1: sqrt2 = sqrt (1/2) = 0.7071 to 4 significant figures