Answer
$x=\frac{y-y_1+mx_1}{m}$
Work Step by Step
Distribute the right side. Then add $mx_1$ on both sides. Then divide both sides by $m$.
$y-y_1=m(x-x_1)$ for $x$
$y-y_1=mx-mx_1$
$y-y_1+mx_1=mx$
$x=\frac{y-y_1+mx_1}{m}$
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