Equations of Perpendicular Lines

Coming to a "T"

It's easy to recognize perpendicular lines on a graph; they come to a T- meeting at a perfect right angle. But what does that mean for the equations of a line?

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Perpendicular lines have slopes that are opposite in two ways. They have the opposite sign, and they are reciprocals. One you know the slope of a line, it's easy enough to solve for the y-intercept, then plug both into the slope-intercept form of a line.

Watch the Virtual GED Class video below for a complete explanation and tons of worked example problems.



Example 1

Example 2

Example 3

Example 4

Example 5

Example 6

Example 7

Challenge 1