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: 66

Answer

The price of the textbook is $165.

Work Step by Step

Let X represent the price of the calculator. The textbook price is $45 more than the price of the calculator. Thus, we obtain that the textbook price is 45 + X Together, the calculator and the mathematics textbook cost 285 dollars. So: X + 45 + X = 285 2X + 45 = 285 Subtract 45 from both sides: 2X = 240 Divide both sides by 2: X = 120 Since the price of the textbook is 45 + X and X = 120, the price of the textbook is 45 + 120 = 165 dollars.
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