Perpendicular lines are two lines that intersect at a right angle (90 degrees). In the Cartesian plane, their slopes are negative reciprocals of each other.
5 Must Know Facts For Your Next Test
Two lines are perpendicular if and only if the product of their slopes is -1.
If one line has a slope of $m$, the perpendicular line will have a slope of $-\frac{1}{m}$.
The equation of a line perpendicular to $y = mx + b$ and passing through point $(x_1, y_1)$ is given by $y - y_1 = -\frac{1}{m}(x - x_1)$.
In coordinate geometry, the x-axis and y-axis are perpendicular to each other.
In three-dimensional space, vectors are perpendicular if their dot product is zero.