Answer
$y=-x+3$ or $x+y=3$
Work Step by Step
Step 1. Given $L$ is parallel to $y=-x$, we can find the slope $m=-1$.
Step 2. Using the point $(1,2)$, we can write the equation as $y-2=-(x-1)$ or $y=-x+3$ or $x+y=3$
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: 44
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