Solve for x
x=-5y-20
Solve for y
y=-\frac{x}{5}-4
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-5y-x=20
Multiply both sides of the equation by 20, the least common multiple of -4,20.
-x=20+5y
Add 5y to both sides.
-x=5y+20
The equation is in standard form.
\frac{-x}{-1}=\frac{5y+20}{-1}
Divide both sides by -1.
x=\frac{5y+20}{-1}
Dividing by -1 undoes the multiplication by -1.
x=-5y-20
Divide 20+5y by -1.
-5y-x=20
Multiply both sides of the equation by 20, the least common multiple of -4,20.
-5y=20+x
Add x to both sides.
-5y=x+20
The equation is in standard form.
\frac{-5y}{-5}=\frac{x+20}{-5}
Divide both sides by -5.
y=\frac{x+20}{-5}
Dividing by -5 undoes the multiplication by -5.
y=-\frac{x}{5}-4
Divide 20+x by -5.
Examples
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y = 3x + 4
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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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