Answer
$\frac{1}{a}$
Work Step by Step
If a line has slope $a$, the slope of its reflection across the line $y = x$ should be $\frac{1}{a}$ which is the result of the process of finding the inverse of the initial line.
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 4 - Inverse, Exponential, and Logarithmic Functions - 4.1 Inverse Functions - 4.1 Exercises - Page 418: 91
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