#### 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, $y=4+0.15x$

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Published by
Pearson

ISBN 10:
0-13417-894-7

ISBN 13:
978-0-13417-894-3

$y=4+0.15x$

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