Question

Line A: y = 1 2 x + 2
Line B: y = -1 2 x + 7
Line C: y = -2x + 4
Line D: y = 1 2 x + 5 4
Which lines are perpendicular?
A)
A and B
B)
A and C
C)
B and C
D)
A and D

Answer 1

Remember that two when two lines are perpendicular, the slope of one equals -1 / the slope of the other. Is that enough to help?