Solve for u
u=\frac{4-v}{3}
Solve for v
v=4-3u
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9u=12-3v
Subtract 3v from both sides.
\frac{9u}{9}=\frac{12-3v}{9}
Divide both sides by 9.
u=\frac{12-3v}{9}
Dividing by 9 undoes the multiplication by 9.
u=\frac{4-v}{3}
Divide 12-3v by 9.
3v=12-9u
Subtract 9u from both sides.
\frac{3v}{3}=\frac{12-9u}{3}
Divide both sides by 3.
v=\frac{12-9u}{3}
Dividing by 3 undoes the multiplication by 3.
v=4-3u
Divide 12-9u by 3.
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