Directions: Determine the slope of each of the lines. Then, determine if the lines are parallel, perpendicular or neither.

Question

Line 1: y = 9

Line 2: x = -3

Slope of Line 1: ?

Slope of Line 2: ?

Parallel/Perpendicular/Neither: ?

Answer 1

slope of line 1 is zero

slope of line 2 is undefined or infinite (+ or -)

the lines are perpendicular, when slopes are negative inverses they're perpendicular.

a flat horizontal line and a vertical line are perpendicular., they form a right angle

line 1 is a horizontal line

line 2 is a vertical line

slope of 0's negative inverse = -1/0 which is undefined