# What is the slope of any line perpendicular to the line passing through (-3,15) and (9,-3)?

the product of two perpendicular lines slope is -1 let us take slope of second line be m . the slope of first line = (15+3)/-12. therefore $m \cdot \left(- \frac{3}{2}\right) = - 1$ from here the slope of the second line comes out to be 2/3