College Algebra / Alg 151 · Atom · ~20 seconds
Perpendicular Lines
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State
Perpendicular lines cross at a right angle; their slopes are negative reciprocals, multiplying to −1.
Show
Slope 2 pairs with slope −1/2: 2 · (−1/2) = −1, a quarter-turn between the lines. Flip the fraction, flip the sign.
Watch for
Vertical lines break the product rule; their perpendicular is horizontal.
Builds on
- Nothing — this is a starting point.
Unlocks
- Nothing yet depends on this.