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Slopes of Perpendicular Lines

Rule

Slopes of Perpendicular Lines

Two lines in a coordinate plane are perpendicular if they intersect at a right angle. All vertical lines are perpendicular to all horizontal lines. Two lines written in slope-intercept form, are perpendicular if and only if the product of their slopes equal

When the product of two slopes equals the slopes are said to be opposite reciprocals. For example, and are opposite reciprocal slopes.