Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 3 - Equations and Problem Solving - 3.2 - Equations and Problem Solving - Problem Set 3.2 - Page 107: 76

Answer

For each extra minute, Tracy is being charged 0.25 dollars.

Work Step by Step

Let X represent the amount Tracy is being charged for each extra minute. A charge for 267 extra minutes means 267X. A charge of 69.99 for the monthly plan and a charge for 267 extra minutes means 69.99 + 267X. The total bill was 136.74. So: 69.99 + 267X = 136.74 Subtract 69.99 from both sides 267X = 66.75 Divide both sides by 267 X = 0.25
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