Answer
$y=x+2$ or $x-y=-2$
Work Step by Step
Step 1. Given $L$ is perpendicular to $y=-x, (m'=-1)$, we can find the slope $m=-\frac{1}{m'}=1$.
Step 2. Using the point $(-1,1)$, we can write the equation as $y-1=x+1$ or $y=x+2$ or $x-y=-2$
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