Solve for n
n=-\frac{b}{1300}+\frac{21}{13}
Solve for b
b=2100-1300n
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1300n=2100-b
Subtract b from both sides.
\frac{1300n}{1300}=\frac{2100-b}{1300}
Divide both sides by 1300.
n=\frac{2100-b}{1300}
Dividing by 1300 undoes the multiplication by 1300.
n=-\frac{b}{1300}+\frac{21}{13}
Divide 2100-b by 1300.
b=2100-1300n
Subtract 1300n from both sides.
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