To prove that the expressions \( y \cdot 3x \) and \( 3xy \) are equivalent using the Commutative Property, we can rearrange the factors in Expression 1:
\[ y \cdot 3x = 3 \cdot y \cdot x = 3xy \]
Thus, both expressions simplify to \( 3xy \), demonstrating their equivalence. This result shows that multiplication is commutative, allowing us to rearrange the order of factors without changing the product.