Solve for x
x=y+3
Solve for y
y=x-3
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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.
12+4y=4x
Swap sides so that all variable terms are on the left hand side.
4y=4x-12
Subtract 12 from both sides.
\frac{4y}{4}=\frac{4x-12}{4}
Divide both sides by 4.
y=\frac{4x-12}{4}
Dividing by 4 undoes the multiplication by 4.
y=x-3
Divide -12+4x by 4.
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