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