Asked by Math

Triangle ΔABC has vertices A(2,5), B(8,1) and C(-2,-1) and is a right triangle. If the slope of AB is -2/3 and the slope of AC is 3/2, are the lines parallel, perpendicular or neither?
Answered by Steve
slopes of parallel lines are equal.
slopes of perpendicular lines are
negative reciprocals.

What do you think?