To solve the equation \( 9 = \frac{x}{5} \), you should perform the operation of multiplication. Specifically, you would multiply both sides of the equation by 5 to isolate \( x \).
Here's how it works:
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Start with the equation: \[ 9 = \frac{x}{5} \]
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Multiply both sides by 5: \[ 9 \times 5 = \frac{x}{5} \times 5 \]
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This simplifies to: \[ 45 = x \]
So, the correct response is Multiplication.