Solve for x
x=4y
Solve for y
y=\frac{x}{4}
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5x=20y
Add 20y to both sides. Anything plus zero gives itself.
\frac{5x}{5}=\frac{20y}{5}
Divide both sides by 5.
x=\frac{20y}{5}
Dividing by 5 undoes the multiplication by 5.
x=4y
Divide 20y by 5.
-20y=-5x
Subtract 5x from both sides. Anything subtracted from zero gives its negation.
\frac{-20y}{-20}=-\frac{5x}{-20}
Divide both sides by -20.
y=-\frac{5x}{-20}
Dividing by -20 undoes the multiplication by -20.
y=\frac{x}{4}
Divide -5x by -20.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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4 \sin \theta \cos \theta = 2 \sin \theta
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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
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Limits
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