Posted by Math on .
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?

Geometry 
Steve,
slopes of parallel lines are equal.
slopes of perpendicular lines are
negative reciprocals.
What do you think?