To prove that the expressions \( y \cdot 3x \) and \( 3xy \) are equivalent using the Commutative Property, we can rearrange the terms in Expression 1. According to the Commutative Property of multiplication, \( y \cdot 3x \) can be rewritten as \( 3 \cdot y \cdot x \) or \( 3xy \), which matches Expression 2.
Thus, we have shown that both expressions are equivalent: \( y \cdot 3x = 3xy \).