Algebra 1 · Linear Functions
Perpendicular Lines
Algebra 1 · Linear Functions
Definition
Perpendicular lines are lines that meet at a right angle, with slopes that are negative reciprocals.
Examples
- Slopes 2 and -1/2 make perpendicular lines.
- Slopes 3 and -1/3 are perpendicular.
Key rule
Multiply the two slopes and you get -1.
Memory hook
Perpendicular = flip it and change the sign.