Answer
run=5 feet
Work Step by Step
We know that the definition of slope is:
$slope=\frac{rise}{run}$
In this case, we have:
$rise=15$
$run=x$
$slope=3$
Thus the slope is:
$slope=\frac{15}{x}=3$
We solve for the run, $x$:
$x=\frac{15}{3}=5$ feet
Intermediate Algebra (12th Edition)
by Lial, Margaret L.; Hornsby, John; McGinnis, Terry
Published by
Pearson
ISBN 10:
0321969359
ISBN 13:
978-0-32196-935-4
Chapter 2 - Section 2.2 - The Slope of a Line - 2.2 Exercises - Page 156: 3
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