Solve for f
f=\frac{y}{4}
Solve for y
y=4f
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\left(-f\right)\left(-4\right)=y
Swap sides so that all variable terms are on the left hand side.
4f=y
Multiply -1 and -4 to get 4.
\frac{4f}{4}=\frac{y}{4}
Divide both sides by 4.
f=\frac{y}{4}
Dividing by 4 undoes the multiplication by 4.
y=4f
Multiply -1 and -4 to get 4.
Examples
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Matrix
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Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
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\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
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Limits
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