Solve for x
x=y-4
Solve for y
y=x+4
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9-x=13-y
Subtract y from both sides.
-x=13-y-9
Subtract 9 from both sides.
-x=4-y
Subtract 9 from 13 to get 4.
\frac{-x}{-1}=\frac{4-y}{-1}
Divide both sides by -1.
x=\frac{4-y}{-1}
Dividing by -1 undoes the multiplication by -1.
x=y-4
Divide 4-y by -1.
y-x=13-9
Subtract 9 from both sides.
y-x=4
Subtract 9 from 13 to get 4.
y=4+x
Add x to both sides.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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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}