Solve for x
x=-3y
Solve for y
y=-\frac{x}{3}
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4x=-12y
Subtract 12y from both sides. Anything subtracted from zero gives its negation.
\frac{4x}{4}=-\frac{12y}{4}
Divide both sides by 4.
x=-\frac{12y}{4}
Dividing by 4 undoes the multiplication by 4.
x=-3y
Divide -12y by 4.
12y=-4x
Subtract 4x from both sides. Anything subtracted from zero gives its negation.
\frac{12y}{12}=-\frac{4x}{12}
Divide both sides by 12.
y=-\frac{4x}{12}
Dividing by 12 undoes the multiplication by 12.
y=-\frac{x}{3}
Divide -4x by 12.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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y = 3x + 4
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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
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
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\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
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Limits
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