Solve for x
x=\frac{91-z-y}{10}
Solve for y
y=91-z-10x
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10x+y=91-z
Subtract z from both sides.
10x=91-z-y
Subtract y from both sides.
\frac{10x}{10}=\frac{91-z-y}{10}
Divide both sides by 10.
x=\frac{91-z-y}{10}
Dividing by 10 undoes the multiplication by 10.
10x+y=91-z
Subtract z from both sides.
y=91-z-10x
Subtract 10x from both sides.
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