Solve for x
x=\frac{9-2y}{5}
Solve for y
y=\frac{9-5x}{2}
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-5x=2y-1-8
Subtract 8 from both sides.
-5x=2y-9
Subtract 8 from -1 to get -9.
\frac{-5x}{-5}=\frac{2y-9}{-5}
Divide both sides by -5.
x=\frac{2y-9}{-5}
Dividing by -5 undoes the multiplication by -5.
x=\frac{9-2y}{5}
Divide 2y-9 by -5.
2y-1=8-5x
Swap sides so that all variable terms are on the left hand side.
2y=8-5x+1
Add 1 to both sides.
2y=9-5x
Add 8 and 1 to get 9.
\frac{2y}{2}=\frac{9-5x}{2}
Divide both sides by 2.
y=\frac{9-5x}{2}
Dividing by 2 undoes the multiplication by 2.
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}