Answer
You sent 138 messages.
Work Step by Step
Let x = Text messages
y = Monthly bill
We will use the equation: $\$40 + 0.10\times x=y$
Plug in the values:
$\$40 + 0.10\times x=\$53.8$
$0.10x=\$13.8$
$x=138$
You sent 138 messages.
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 1, Equations and Inequalities - 1.5 Use Problem Solving Strategies and Models - 1.5 Exercises - Problem Solving - Page 39: 28b
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