Solve for x
x=y+3
Solve for y
y=x-3
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4x=12+4y
Add 4y to both sides.
4x=4y+12
The equation is in standard form.
\frac{4x}{4}=\frac{4y+12}{4}
Divide both sides by 4.
x=\frac{4y+12}{4}
Dividing by 4 undoes the multiplication by 4.
x=y+3
Divide 12+4y by 4.
-4y=12-4x
Subtract 4x from both sides.
\frac{-4y}{-4}=\frac{12-4x}{-4}
Divide both sides by -4.
y=\frac{12-4x}{-4}
Dividing by -4 undoes the multiplication by -4.
y=x-3
Divide 12-4x by -4.
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