Solve for a
a=4-b
Solve for b
b=4-a
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2a=8-2b
Subtract 2b from both sides.
\frac{2a}{2}=\frac{8-2b}{2}
Divide both sides by 2.
a=\frac{8-2b}{2}
Dividing by 2 undoes the multiplication by 2.
a=4-b
Divide 8-2b by 2.
2b=8-2a
Subtract 2a from both sides.
\frac{2b}{2}=\frac{8-2a}{2}
Divide both sides by 2.
b=\frac{8-2a}{2}
Dividing by 2 undoes the multiplication by 2.
b=4-a
Divide 8-2a by 2.
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