Solve for n
n=300-3y_{n}
Solve for y_n
y_{n}=-\frac{n}{3}+100
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100-\frac{n}{3}=y_{n}
Swap sides so that all variable terms are on the left hand side.
-\frac{n}{3}=y_{n}-100
Subtract 100 from both sides.
-n=3y_{n}-300
Multiply both sides of the equation by 3.
\frac{-n}{-1}=\frac{3y_{n}-300}{-1}
Divide both sides by -1.
n=\frac{3y_{n}-300}{-1}
Dividing by -1 undoes the multiplication by -1.
n=300-3y_{n}
Divide -300+3y_{n} by -1.
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