Select the pair of equations whose graphs are perpendicular.

5x – 8y = 9
12x – 5y = 7

x + 6y = 8
y = 2x – 8

y = 2x – 7
x + 2y = 3

2y = –3x + 5
2x + 3y = 4

Question

Select the pair of equations whose graphs are perpendicular.

       5x – 8y = 9
            12x – 5y = 7

       x + 6y = 8
            y = 2x – 8 

       y = 2x – 7
            x + 2y = 3

       2y = –3x + 5
            2x + 3y = 4

anonymous · Answer

in order for the graphs to be perpendicular the slopes would have to be negative recipricals of each other so find the slope first.