Respuesta :

Since y and x are inversely related, we can write,

[tex]y=\frac{k}{x}[/tex]

then, the constant of proportionality k is given by

[tex]k=y\cdot x[/tex]

By substituting the given values, we have

[tex]\begin{gathered} k=4\times20 \\ k=80 \end{gathered}[/tex]

So the relation is given by

[tex]y=\frac{80}{x}[/tex]

Then, the answer is the second option

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