These lines have different slopes so they cannot be parallel. We can determine if they are perpendicular by multiplying the slopes. Let's start with lines a and b.
-1/4 (4)=- 1
Since the product of the slopes equals -1, the lines are perpendicular. Since the slopes of lines b and c are both positive, the lines are not perpendicular, since its product cannot be negative. Now, let's multiply the slopes of lines a and c.
-1/4 ( 1/4 )= - 1/16
Since the product of the slopes does not equal -1, the lines are not perpendicular.
