Intermediate Algebra (6th Edition)

Published by Pearson
ISBN 10: 0321785045
ISBN 13: 978-0-32178-504-6

Chapter 3 - Section 3.4 - The Slope of a Line - Exercise Set: 40


Graph C

Work Step by Step

We are given that $f(x)=-2x-3$, which is written in the slope-intercept form $y=mx+b$, where m is the slope of the line and the point (0,b) is the y-intercept of the line. Therefore, m=-2 and b=-3, so the line has a positive slope and has a y-intercept of (0,-3). As Example 2 on pg. 154 shows, lines with a negative slope are downward slanting, which narrows our choices to Graphs B and C. However, Graph C is the only one of these two graphs that has a y-intercept of (0,-3), so the correct graph is Graph C.
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