Question

Which two lines are perpendicular?

A) A and B

B) B and C

C) A and D

D) C and D

Answer 1

C)

Explanation:

the rule: if slope1*slope2= -1, then the two given lines are perpendicular.

1) the slope of the line A is -3; B is 3; C is 3; D is 1/3, then

2) according to the rule A and B not perpendicular; B and C not perpendicular; A and D are perpendicular; C and D not perpendicular.