Answer
$4(x+y)$ miles.
Work Step by Step
The distance the motorboat travels will be the product of the average velocity and the time; assuming the boat travels with the current, we have $d=4(x+y)$ miles.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 7 - Section 7.1 - Systems of Linear Equations in Two Variables - Concept and Vocabulary Check - Page 817: 10
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