Solve for x
x=200-9y
Solve for y
y=\frac{200-x}{9}
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x+15=215-9y
Subtract 9y from both sides.
x=215-9y-15
Subtract 15 from both sides.
x=200-9y
Subtract 15 from 215 to get 200.
9y+15=215-x
Subtract x from both sides.
9y=215-x-15
Subtract 15 from both sides.
9y=200-x
Subtract 15 from 215 to get 200.
\frac{9y}{9}=\frac{200-x}{9}
Divide both sides by 9.
y=\frac{200-x}{9}
Dividing by 9 undoes the multiplication by 9.
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