Answer
$y=4+0.15x$
Work Step by Step
Let $x$ = number of text messages in a month
Let $y$ = monthly cost of $x$ number of messages
Hence, $y=4+0.15x$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 1 - Section 1.5 - Problem Solving and Using Formulas - Concept and Vocabulary Check - Page 65: 3
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