Solve for x
x=-2y-18
Solve for y
y=-\frac{x}{2}-9
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x-y=1.5x+9
Multiply both sides of the equation by 3.
x-y-1.5x=9
Subtract 1.5x from both sides.
-0.5x-y=9
Combine x and -1.5x to get -0.5x.
-0.5x=9+y
Add y to both sides.
-0.5x=y+9
The equation is in standard form.
\frac{-0.5x}{-0.5}=\frac{y+9}{-0.5}
Multiply both sides by -2.
x=\frac{y+9}{-0.5}
Dividing by -0.5 undoes the multiplication by -0.5.
x=-2y-18
Divide 9+y by -0.5 by multiplying 9+y by the reciprocal of -0.5.
x-y=1.5x+9
Multiply both sides of the equation by 3.
-y=1.5x+9-x
Subtract x from both sides.
-y=0.5x+9
Combine 1.5x and -x to get 0.5x.
-y=\frac{x}{2}+9
The equation is in standard form.
\frac{-y}{-1}=\frac{\frac{x}{2}+9}{-1}
Divide both sides by -1.
y=\frac{\frac{x}{2}+9}{-1}
Dividing by -1 undoes the multiplication by -1.
y=-\frac{x}{2}-9
Divide \frac{x}{2}+9 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
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