$$y = 4 x - 8$$
$x=\frac{y+8}{4}$
$$4x-8=y$$
$$4x=y+8$$
$$\frac{4x}{4}=\frac{y+8}{4}$$
$$x=\frac{y+8}{4}$$
$$x=\frac{y}{4}+2$$
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$y=4\left(x-2\right)$