Answer
$y=\frac{12}{\sqrt x}$
Work Step by Step
Step 1. Write the general form as $y=\frac{k}{\sqrt x}$ where $k$ is a constant.
Step 2. Use the given condition, $4=\frac{k}{\sqrt 9}$, thus $k=12$
Step 3. We have $y=\frac{12}{\sqrt x}$
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