Solve for x
x=9-4y
Solve for y
y=\frac{9-x}{4}
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x-1+4y=8
Multiply both sides of the equation by 4.
x+4y=8+1
Add 1 to both sides.
x+4y=9
Add 8 and 1 to get 9.
x=9-4y
Subtract 4y from both sides.
x-1+4y=8
Multiply both sides of the equation by 4.
-1+4y=8-x
Subtract x from both sides.
4y=8-x+1
Add 1 to both sides.
4y=9-x
Add 8 and 1 to get 9.
\frac{4y}{4}=\frac{9-x}{4}
Divide both sides by 4.
y=\frac{9-x}{4}
Dividing by 4 undoes the multiplication by 4.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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Linear equation
y = 3x + 4
Arithmetic
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Matrix
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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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