Solve for x
x=\frac{y}{3}
Solve for y
y=3x
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12x=4y
Swap sides so that all variable terms are on the left hand side.
\frac{12x}{12}=\frac{4y}{12}
Divide both sides by 12.
x=\frac{4y}{12}
Dividing by 12 undoes the multiplication by 12.
x=\frac{y}{3}
Divide 4y by 12.
4y=12x
The equation is in standard form.
\frac{4y}{4}=\frac{12x}{4}
Divide both sides by 4.
y=\frac{12x}{4}
Dividing by 4 undoes the multiplication by 4.
y=3x
Divide 12x by 4.
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