Wade should use the multiplication property of equality to solve the equation \(\frac{x}{6} = 3\). This property states that if two expressions are equal, you can multiply both sides of the equation by the same nonzero number (in this case, 6) to maintain the equality.
So, Wade would multiply both sides of the equation by 6:
\[ 6 \cdot \frac{x}{6} = 6 \cdot 3 \]
This simplifies to:
\[ x = 18 \]
Thus, the multiplication property of equality is the correct choice.
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