Answer
The required equation is $x=k\frac{yz}{{{w}^{2}}}$ and the value of $y$ is $\frac{x{{w}^{2}}}{kz}$.
Work Step by Step
As the value of $x$ varies jointly as $y$ and $z$ , and inversely as ${{w}^{2}}$ , we have
$x=k\frac{yz}{{{w}^{2}}}$
Where $k$ is a constant.
Now, solve above equation for $y$.
Divide $x=k\frac{yz}{{{w}^{2}}}$ by $\frac{{{w}^{2}}}{kz}$.
$y=\frac{x{{w}^{2}}}{kz}$
