Question 106583
If ABC is a right angle triangle, then two of the SLOPES will be NEGATIVE RECIPROCALS because they will be PERPENDICULAR BISECTORS (90 degrees)

a=(-6,3) b=(3,-5) c=(-1,5)

Therefore, we need to find the slope of all 3 sides of the triangle.

Use the slope formula, {{{y2-y1/x2-x1}}}