Solve for y
y=-3
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3y+y=-12
Add y to both sides.
4y=-12
Combine 3y and y to get 4y.
y=\frac{-12}{4}
Divide both sides by 4.
y=-3
Divide -12 by 4 to get -3.
Examples
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Linear equation
y = 3x + 4
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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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