Answer
$\dfrac1a$
Work Step by Step
A line with slope $a$, when reflected across $y=x$, will have new slope $\dfrac1a$.
College Algebra (11th Edition)
by Lial, Margaret L.; Hornsby John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671791
ISBN 13:
978-0-32167-179-0
Chapter 4 - Section 4.1 - Inverse Functions - 4.1 Exercises - Page 397: 91
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