Answer
$f^{-1}(x)=\frac{x+8}{5}$
Work Step by Step
$$f(x)=5x-8$$ $$y=5x-8$$ $$x=5y-8$$ $$5y=x+8$$ $$y=\frac{x+8}{5}$$ $$f^{-1}(x)=\frac{x+8}{5}$$
Big Ideas Math - Algebra 1, A Common Core Curriculum
by Larson, Ron; Boswell, Laurie
Published by
Big Ideas Learning LLC
ISBN 10:
978-1-60840-838-2
ISBN 13:
978-1-60840-838-2
Chapter 10 - Radical Functions and Equations - Chapter Test - Page 579: 1
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