Answer
$y=-2x-2.$
Work Step by Step
We know that if the slope of a line is $m$ the y-intercept is $P_1(0,y_1)$, then its equation is: $y=mx+y_1.$
Hence here: $y=-2x-2.$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 1 - Graphs - 1.3 Lines - 1.3 Assess Your Understanding - Page 31: 54
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