Substituting 1 for \( x \) in the equation \( 5x + 3 = x \cdot 5 + 3 \) is a test case for the Commutative Property of Multiplication. This property states that changing the order of the factors does not change the product, which is demonstrated by how both sides of the equation evaluate to the same expression when \( x \) is replaced with a specific value (in this case, 1).
So, the correct response is:
The Commutative Property of Multiplication.
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