Answer
0
Work Step by Step
$y+15=0$
$y+15-15=0-15$
$y=-15$
The slope of a horizontal line is 0.
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 8 - Section 8.3 - The Slope of a Line - Exercises - Page 310: 30
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