Commutative property of addition.
Work Step by Step
The commutative property of addition explained: The sum of numbers in a particular order is the same as the sum of the same numbers but in a different order. Adding the same numbers in any order will yield only one answer. Example: 2 + 3 +4 = 9 3 + 2 + 4 also is = 9 and 4 + 2 + 3 = 9 Similarly, as given, 3 + y = y + 3