Question

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

Answer 1

perpendicular lines
have opposite slopes
x
and
-x