Calculus (3rd Edition)

Published by W. H. Freeman
ISBN 10: 1464125260
ISBN 13: 978-1-46412-526-3

Chapter 1 - Precalculus Review - 1.2 Linear and Quadratic Functions - Exercises - Page 18: 19



Work Step by Step

When an equation is in slope-intercept form, or y=mx+b form, m=slope and b=y-intercept. If a line is horizontal, then it has a slope of 0. Therefore, y=(0)x+b=0+b=b The y-intercept is the y value where x=0, and since this line has a slope of 0 and passes through the point (8, 4) it also passes through the point (0, 4), because the line is horizontal. Therefore, the y-intercept=4.
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