Question 958609
Either plot the points on paper (graph) or visualize the set of them, and note that the hypotenuse will be from (-5,3) to (5,-3).  No trouble should be in identifying the point (-5,-3) as where the right angle is.


Use the distance formula for (-5,3) to (5,-3).
{{{sqrt((-5-5)^2+(3-(-3))^2)}}}
Compute that.