Solve for a
a=\frac{b-7y}{2}
Solve for b
b=7y+2a
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2a=b-7y
Subtract 7y from both sides.
\frac{2a}{2}=\frac{b-7y}{2}
Divide both sides by 2.
a=\frac{b-7y}{2}
Dividing by 2 undoes the multiplication by 2.
b=7y+2a
Swap sides so that all variable terms are on the left hand side.
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Limits
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