Solve for x
x=\frac{-y-7}{3}
Solve for y
y=-3x-7
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-3x-7=y
Swap sides so that all variable terms are on the left hand side.
-3x=y+7
Add 7 to both sides.
\frac{-3x}{-3}=\frac{y+7}{-3}
Divide both sides by -3.
x=\frac{y+7}{-3}
Dividing by -3 undoes the multiplication by -3.
x=\frac{-y-7}{3}
Divide y+7 by -3.
Examples
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Simultaneous equation
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Limits
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