Solve for a
a=\frac{28-4b}{11}
Solve for b
b=-\frac{11a}{4}+7
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11a+4b=28
Swap sides so that all variable terms are on the left hand side.
11a=28-4b
Subtract 4b from both sides.
\frac{11a}{11}=\frac{28-4b}{11}
Divide both sides by 11.
a=\frac{28-4b}{11}
Dividing by 11 undoes the multiplication by 11.
11a+4b=28
Swap sides so that all variable terms are on the left hand side.
4b=28-11a
Subtract 11a from both sides.
\frac{4b}{4}=\frac{28-11a}{4}
Divide both sides by 4.
b=\frac{28-11a}{4}
Dividing by 4 undoes the multiplication by 4.
b=-\frac{11a}{4}+7
Divide 28-11a by 4.
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