Solve for f (complex solution)
\left\{\begin{matrix}f=-\frac{y}{4-x}\text{, }&x\neq 4\\f\in \mathrm{C}\text{, }&y=0\text{ and }x=4\end{matrix}\right.
Solve for x (complex solution)
\left\{\begin{matrix}x=\frac{y}{f}+4\text{, }&f\neq 0\\x\in \mathrm{C}\text{, }&y=0\text{ and }f=0\end{matrix}\right.
Solve for f
\left\{\begin{matrix}f=-\frac{y}{4-x}\text{, }&x\neq 4\\f\in \mathrm{R}\text{, }&y=0\text{ and }x=4\end{matrix}\right.
Solve for x
\left\{\begin{matrix}x=\frac{y}{f}+4\text{, }&f\neq 0\\x\in \mathrm{R}\text{, }&y=0\text{ and }f=0\end{matrix}\right.
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y=fx-4f
Use the distributive property to multiply f by x-4.
fx-4f=y
Swap sides so that all variable terms are on the left hand side.
\left(x-4\right)f=y
Combine all terms containing f.
\frac{\left(x-4\right)f}{x-4}=\frac{y}{x-4}
Divide both sides by x-4.
f=\frac{y}{x-4}
Dividing by x-4 undoes the multiplication by x-4.
y=fx-4f
Use the distributive property to multiply f by x-4.
fx-4f=y
Swap sides so that all variable terms are on the left hand side.
fx=y+4f
Add 4f to both sides.
\frac{fx}{f}=\frac{y+4f}{f}
Divide both sides by f.
x=\frac{y+4f}{f}
Dividing by f undoes the multiplication by f.
x=\frac{y}{f}+4
Divide y+4f by f.
y=fx-4f
Use the distributive property to multiply f by x-4.
fx-4f=y
Swap sides so that all variable terms are on the left hand side.
\left(x-4\right)f=y
Combine all terms containing f.
\frac{\left(x-4\right)f}{x-4}=\frac{y}{x-4}
Divide both sides by x-4.
f=\frac{y}{x-4}
Dividing by x-4 undoes the multiplication by x-4.
y=fx-4f
Use the distributive property to multiply f by x-4.
fx-4f=y
Swap sides so that all variable terms are on the left hand side.
fx=y+4f
Add 4f to both sides.
\frac{fx}{f}=\frac{y+4f}{f}
Divide both sides by f.
x=\frac{y+4f}{f}
Dividing by f undoes the multiplication by f.
x=\frac{y}{f}+4
Divide y+4f by f.
Examples
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y = 3x + 4
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699 * 533
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
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}