Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

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 30: 57



Work Step by Step

If the slope equals to $0$, we can surely state that the line is horizontal. The equation of a horizontal line is always in the form of: $y=a$, where $a$ is constant. Here, the point given is $(-3,2)$, which is on the line. For this point, $y=2$ and this should be true for the other points on the line. The equation is, therefore: $y=2$
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