Answer
-3x + y = 6
Work Step by Step
We use the formula $y=mx+b$
$y=3x+b$
now plug in $x=0$ and $y=6$ to get b:
6 = 3(0) + b
6 = 0 + b
b=6
$y=3x+6$
and it must be written in standard form $Ax+By=C$, so rearrange:
-3x + y = 6
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