Answer
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Work Step by Step
From the previous result: $-2x_1x_2(m_1m_2+1)=0$, we have $x_1x_2=0$ or $m_1m_2+1=0$ which gives $m_1m_2=-1$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 2 - Graphs and Functions - 2.5 Equations of Lines and Linear Models - 2.5 Exercises - Page 247: 84
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