Prove that if the slopes of two nonvertical lines are negative reciprocals of each other, then the lines are perpendicular.

Elementary Algebra
17th Edition
ISBN:9780998625713
Author:Lynn Marecek, MaryAnne Anthony-Smith
Publisher:Lynn Marecek, MaryAnne Anthony-Smith
Chapter4: Graphs
Section4.5: Use The Slope–intercept Form Of An Equation Of A Line
Problem 4.111TI: Use slopes to determine if the lines 5x+4y=1 and 4x+5y=3 are perpendicular.
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Prove that if the slopes of two nonvertical lines are negative reciprocals of each other, then the lines are perpendicular.

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