$$42-2y=4x$$
$x=\frac{21-y}{2}$
$$4x=42-2y$$
$$\frac{4x}{4}=\frac{42-2y}{4}$$
$$x=\frac{42-2y}{4}$$
$$x=\frac{21-y}{2}$$
Show Solution
Hide Solution
$y=21-2x$
$$-2y=4x-42$$
$$\frac{-2y}{-2}=\frac{4x-42}{-2}$$
$$y=\frac{4x-42}{-2}$$
$$y=21-2x$$
