S varies inversely as $G.$ If $S$ is $7$ when $G$ is $4\mathrm{.}9,$ find $S$ when $G$ is $7.$

a$)$ Write the variation.

b$)$ Find $S$ when $G$ is $7.$

a$)$ How are these two variables related?

A$.$

$s=\frac{k}{G^2}$

B$.S=k{G}^2$

C$.S=kG$

D$.$

$S=\frac{k}{G}$