Are two lines perpendicular?
Keeping this in consideration, are the two lines parallel perpendicular or neither?
The slopes are not the same or negative reciprocals of each other, so the lines are neither parallel nor perpendicular.
In this manner, are these lines perpendicular?
Put this together with the sign change, and you get that the slope of a perpendicular line is the "negative reciprocal" of the slope of the original line — and two lines with slopes that are negative reciprocals of each other are perpendicular to each other.
Perpendicular - Definition with Examples Two distinct lines intersecting each other at 90° or a right angle are called perpendicular lines. Example: Here, AB is perpendicular to XY because AB and XY intersect each other at 90°. Non-Example: The two lines are parallel and do not intersect each other.