Solve for x
x=\frac{y-z-90}{3}
Solve for y
y=3x+z+90
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3x=y-z-90
The equation is in standard form.
\frac{3x}{3}=\frac{y-z-90}{3}
Divide both sides by 3.
x=\frac{y-z-90}{3}
Dividing by 3 undoes the multiplication by 3.
x=\frac{y}{3}-\frac{z}{3}-30
Divide -90+y-z by 3.
-90+y-z=3x
Swap sides so that all variable terms are on the left hand side.
y-z=3x+90
Add 90 to both sides.
y=3x+90+z
Add z to both sides.
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Limits
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