Answer:

Explanation:
So first realize that if you make the right triangle the sides should have x2-x1 and y2-y1 length(straight up and down).
So the length of horizontal line is -3-(6) = -9
The length of vertical line is 8-6=2
after knowing your side length you can simply use Pythagorean theorem to get you answer.
9^2+2^2=85 = c^2
c=
