SOLUTION
For an inverse variation, we have that y is inversely proportional to x, written as
[tex]\begin{gathered} y\propto\frac{1}{x} \\ \propto\text{ is a proportionality sign} \end{gathered}[/tex]
removing the proportionality sign and introducing a constant k, we have that
[tex]y=\frac{k}{x}[/tex]
so, if k is 9,
The answer becomes
[tex]y=\frac{9}{x}[/tex]
Option A is the answer
