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Can 2 Lines With Negative Slopes Be Perpendicular? [Solved]
If the slopes of two lines are negative reciprocals, the lines are perpendicular. since their slopes of 0 have undefined reciprocals. Vertical and horizontal lines are perpendicular.
Proof: perpendicular lines have negative reciprocal slope | High School Math | Khan Academy
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Negative Reciprocals and Slopes of Perpendicular Lines
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