Intermediate Algebra: Connecting Concepts through Application

Published by Brooks Cole
ISBN 10: 0-53449-636-9
ISBN 13: 978-0-53449-636-4

Chapter 1 - Linear Functions - 1.5 Finding Equations of Lines - 1.5 Exercises: 76

Answer

The student accidentally used the x-intercept instead of the y-intercept for b. The correct equation is y=-3x+21.

Work Step by Step

The given point was the x-intercept, but the student mistook it for the y-intercept and plugged it in for b. y=mx+b 0=-3(7)+b b-21=0 b=21 Therefore, the correct equation is y=-3x+21.
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