Solve for x
x=\frac{5-y}{2}
Solve for y
y=5-2x
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2x+4=9-y
Combine x and x to get 2x.
2x=9-y-4
Subtract 4 from both sides.
2x=5-y
Subtract 4 from 9 to get 5.
\frac{2x}{2}=\frac{5-y}{2}
Divide both sides by 2.
x=\frac{5-y}{2}
Dividing by 2 undoes the multiplication by 2.
2x+4=9-y
Combine x and x to get 2x.
9-y=2x+4
Swap sides so that all variable terms are on the left hand side.
-y=2x+4-9
Subtract 9 from both sides.
-y=2x-5
Subtract 9 from 4 to get -5.
\frac{-y}{-1}=\frac{2x-5}{-1}
Divide both sides by -1.
y=\frac{2x-5}{-1}
Dividing by -1 undoes the multiplication by -1.
y=5-2x
Divide 2x-5 by -1.
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}