Solve for x
x=9-3y
Solve for y
y=-\frac{x}{3}+3
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-\frac{1}{3}x+3=y
Swap sides so that all variable terms are on the left hand side.
-\frac{1}{3}x=y-3
Subtract 3 from both sides.
\frac{-\frac{1}{3}x}{-\frac{1}{3}}=\frac{y-3}{-\frac{1}{3}}
Multiply both sides by -3.
x=\frac{y-3}{-\frac{1}{3}}
Dividing by -\frac{1}{3} undoes the multiplication by -\frac{1}{3}.
x=9-3y
Divide y-3 by -\frac{1}{3} by multiplying y-3 by the reciprocal of -\frac{1}{3}.
Examples
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y = 3x + 4
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Matrix
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Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
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Limits
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