Solve for x
x=\frac{y}{3}
Solve for y
y=3x
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-3x=-y
Subtract y from both sides. Anything subtracted from zero gives its negation.
\frac{-3x}{-3}=-\frac{y}{-3}
Divide both sides by -3.
x=-\frac{y}{-3}
Dividing by -3 undoes the multiplication by -3.
x=\frac{y}{3}
Divide -y by -3.
y=3x
Add 3x to both sides. Anything plus zero gives itself.
Examples
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Linear equation
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Matrix
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Simultaneous equation
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\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
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Limits
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