Solve for C
C=800-10n
Solve for n
n=-\frac{C}{10}+80
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C=0n^{2}-10n+800
Multiply 0 and 25 to get 0.
C=0-10n+800
Anything times zero gives zero.
C=800-10n
Add 0 and 800 to get 800.
C=0n^{2}-10n+800
Multiply 0 and 25 to get 0.
C=0-10n+800
Anything times zero gives zero.
C=800-10n
Add 0 and 800 to get 800.
800-10n=C
Swap sides so that all variable terms are on the left hand side.
-10n=C-800
Subtract 800 from both sides.
\frac{-10n}{-10}=\frac{C-800}{-10}
Divide both sides by -10.
n=\frac{C-800}{-10}
Dividing by -10 undoes the multiplication by -10.
n=-\frac{C}{10}+80
Divide C-800 by -10.
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