Solve for x
x=\frac{y+9}{8}
Solve for y
y=8x-9
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8x-y=9
Multiply 4 and 2 to get 8.
8x=9+y
Add y to both sides.
8x=y+9
The equation is in standard form.
\frac{8x}{8}=\frac{y+9}{8}
Divide both sides by 8.
x=\frac{y+9}{8}
Dividing by 8 undoes the multiplication by 8.
8x-y=9
Multiply 4 and 2 to get 8.
-y=9-8x
Subtract 8x from both sides.
\frac{-y}{-1}=\frac{9-8x}{-1}
Divide both sides by -1.
y=\frac{9-8x}{-1}
Dividing by -1 undoes the multiplication by -1.
y=8x-9
Divide 9-8x by -1.
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}