Solve for x
x=2y+1
Solve for y
y=\frac{x-1}{2}
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5x=10y-4+9
Add 9 to both sides.
5x=10y+5
Add -4 and 9 to get 5.
\frac{5x}{5}=\frac{10y+5}{5}
Divide both sides by 5.
x=\frac{10y+5}{5}
Dividing by 5 undoes the multiplication by 5.
x=2y+1
Divide 10y+5 by 5.
10y-4=5x-9
Swap sides so that all variable terms are on the left hand side.
10y=5x-9+4
Add 4 to both sides.
10y=5x-5
Add -9 and 4 to get -5.
\frac{10y}{10}=\frac{5x-5}{10}
Divide both sides by 10.
y=\frac{5x-5}{10}
Dividing by 10 undoes the multiplication by 10.
y=\frac{x-1}{2}
Divide -5+5x by 10.
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}