Answer
$5$
Work Step by Step
$\sqrt {3x+1}=4$, take square on both sides,
$3x+1=16$,
thus $x=5$, check, it fits.
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 10 - Systems of Equations and Inequalities - Cumulative Review - Page 817: 2
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