Answer:
[tex]y = \frac{1}{200}[/tex]
Step-by-step explanation:
[tex]y[/tex] ∝ [tex]\frac{k}{x^{2} }[/tex] (k is a constant we need)
[tex]\frac{1}{72} = \frac{k}{3^{2} }[/tex]
[tex]k = 0.125[/tex]
[tex]y = \frac{0.125}{5^{2} }[/tex]
[tex]y=\frac{1}{200}[/tex]
