Solve for y
y=\frac{x}{9}
Solve for x
x=9y
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-9y=-x
Subtract x from both sides. Anything subtracted from zero gives its negation.
\frac{-9y}{-9}=-\frac{x}{-9}
Divide both sides by -9.
y=-\frac{x}{-9}
Dividing by -9 undoes the multiplication by -9.
y=\frac{x}{9}
Divide -x by -9.
x=9y
Add 9y to both sides. Anything plus zero gives itself.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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Linear equation
y = 3x + 4
Arithmetic
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Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
Simultaneous equation
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Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
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Limits
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