Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 1, Equations and Inequalities - 1.2 Evaluate and Simplify Algebraic Expressions - 1.2 Exercises - Problem Solving - Page 15: 59


$=270 - 4.5 x$

Work Step by Step

We know that the balance on the card starts at 270 dollars and decreases by 4.5 dollars per lunch. Thus, the coefficient in front of x is -4.5, making the expression: $=270 - 4.5 x$ It is important to note that this makes sense for most positive integers, given that the overall balance does not become negative. Thus, as long as x is a small enough positive integer, the expression will make sense.
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