Solve for x
x=\frac{3-y}{4}
Solve for y
y=3-4x
Graph
Share
Copied to clipboard
12x=9-3y
Subtract 3y from both sides.
\frac{12x}{12}=\frac{9-3y}{12}
Divide both sides by 12.
x=\frac{9-3y}{12}
Dividing by 12 undoes the multiplication by 12.
x=\frac{3-y}{4}
Divide 9-3y by 12.
3y=9-12x
Subtract 12x from both sides.
\frac{3y}{3}=\frac{9-12x}{3}
Divide both sides by 3.
y=\frac{9-12x}{3}
Dividing by 3 undoes the multiplication by 3.
y=3-4x
Divide 9-12x by 3.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
699 * 533
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.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}