Substituting 1 for \( x \) in the equation \( 5x + 3 = x \cdot 5 + 3 \) is a test case for the Commutative Property of Multiplication.
The Commutative Property states that changing the order of the numbers in a multiplication operation does not change the product (i.e., \( a \cdot b = b \cdot a \)). In this case, \( 5x \) is rearranged as \( x \cdot 5 \).
So, the answer is:
The Commutative Property of Multiplication.
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