$$5x-y=3 \times (4)$$
$x=\frac{y+12}{5}$
$$5x-y=12$$
$$5x=12+y$$
$$5x=y+12$$
$$\frac{5x}{5}=\frac{y+12}{5}$$
$$x=\frac{y+12}{5}$$
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$y=5x-12$
$$-y=12-5x$$
$$\frac{-y}{-1}=\frac{12-5x}{-1}$$
$$y=\frac{12-5x}{-1}$$
$$y=5x-12$$
