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: 72

Answer

The executive was earning 80,000 4 years ago.

Work Step by Step

Let X represent her salary 4 years ago. Twice her salary 4 years ago means 2X 15,000 less than twice her salary 4 years ago means 2X - 15,000 She is now earning 145,000. So: 2X - 15,000 = 145,000 Add 15,000 to both sides 2X = 160,000 Divide both sides by 2 X = 80,000
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