Solve for a
a=\frac{35-4b}{3}
Solve for b
b=\frac{35-3a}{4}
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3a=35-4b
Subtract 4b from both sides.
\frac{3a}{3}=\frac{35-4b}{3}
Divide both sides by 3.
a=\frac{35-4b}{3}
Dividing by 3 undoes the multiplication by 3.
4b=35-3a
Subtract 3a from both sides.
\frac{4b}{4}=\frac{35-3a}{4}
Divide both sides by 4.
b=\frac{35-3a}{4}
Dividing by 4 undoes the multiplication by 4.
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