Question

$$y=3 \sqrt{ x }$$

Answer

$$x=y^2/9$$

Solution


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Square both sides.
\[{y}^{2}=9x\]
Divide both sides by \(9\).
\[\frac{{y}^{2}}{9}=x\]
Switch sides.
\[x=\frac{{y}^{2}}{9}\]