Answer
$y=b$;
$b$ is the y-intercept
Work Step by Step
A horizontal line is given by an equation of the form $y=b$ where $b$ is the y-intercept.
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 F - Foundations: A Prelude to Functions - Section F.3 Lines - F.3 Assess Your Understanding - Page 29: 3
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