Answer
$m=1/2$
Work Step by Step
The given line goes through $(2,0)$ and $(0,4)$.
$m=(0-4)/(2-0)$
$m = -4/2 = -2$
Perpendicular lines would have a slope where the multiplied slopes would equal $-1$.
$m*-2 = -1$
$m = 1/2$
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