Solve for B
B=-\frac{A}{2}+3
Solve for A
A=6-2B
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2B=6-A
Subtract A from both sides.
\frac{2B}{2}=\frac{6-A}{2}
Divide both sides by 2.
B=\frac{6-A}{2}
Dividing by 2 undoes the multiplication by 2.
B=-\frac{A}{2}+3
Divide 6-A by 2.
A=6-2B
Subtract 2B from both sides.
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