Solve for x
x=\frac{100-z-y}{9}
Solve for y
y=100-z-9x
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9x+z=100-y
Subtract y from both sides.
9x=100-y-z
Subtract z from both sides.
9x=100-z-y
The equation is in standard form.
\frac{9x}{9}=\frac{100-z-y}{9}
Divide both sides by 9.
x=\frac{100-z-y}{9}
Dividing by 9 undoes the multiplication by 9.
y+z=100-9x
Subtract 9x from both sides.
y=100-9x-z
Subtract z from both sides.
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