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 - Page 77: 75


The student plugged in the wrong number for the y-intercept. The correct equation is y=4x-2.

Work Step by Step

In this equation, the student incorrectly put 6 as the value for b, the y-intercept. The correct way to solve this is to plug in the slope for m and the given point for x and y in the slope-intercept equation. Then, solve for b. y=mx+b 6=4(2)+b b+8=6 b=-2 Therefore, the correct equation is y=4x-2.
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