Solve for x
x=y
Solve for y
y=x
Graph
Share
Copied to clipboard
x^{2}+7y-18=x^{2}+7x-18
Use the distributive property to multiply x-2 by x+9 and combine like terms.
x^{2}+7y-18-x^{2}=7x-18
Subtract x^{2} from both sides.
7y-18=7x-18
Combine x^{2} and -x^{2} to get 0.
7x-18=7y-18
Swap sides so that all variable terms are on the left hand side.
7x=7y-18+18
Add 18 to both sides.
7x=7y
Add -18 and 18 to get 0.
x=y
Cancel out 7 on both sides.
x^{2}+7y-18=x^{2}+7x-18
Use the distributive property to multiply x-2 by x+9 and combine like terms.
7y-18=x^{2}+7x-18-x^{2}
Subtract x^{2} from both sides.
7y-18=7x-18
Combine x^{2} and -x^{2} to get 0.
7y=7x-18+18
Add 18 to both sides.
7y=7x
Add -18 and 18 to get 0.
y=x
Cancel out 7 on both sides.
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}