ANSWER
y varies inversely as x exponent 4.
EXPLANATION
The inverse variation equation is given as:
![y = \frac{1}{ {x}^(4) }](https://img.qammunity.org/2020/formulas/mathematics/high-school/hdzytrtw6iwgpvqqdxo8k9gktaeasvtpbh.png)
We can see that there is an inverse relation between the quantity y and x.
If the it were
, we say y varies inversely as the square of x.
Hence for the given relation,the precise definition is that, y varies inversely as x exponent 4.