$$2x-y=-1$$
$x=\frac{y-1}{2}$
$$2x=-1+y$$
$$2x=y-1$$
$$\frac{2x}{2}=\frac{y-1}{2}$$
$$x=\frac{y-1}{2}$$
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$y=2x+1$
$$-y=-1-2x$$
$$-y=-2x-1$$
$$\frac{-y}{-1}=\frac{-2x-1}{-1}$$
$$y=\frac{-2x-1}{-1}$$
$$y=2x+1$$
