Asked by Hannah

What property justifies that 3y+9 = 9+3y
Answered by helper
3y + 9 = 9 + 3y
Commutative Property

For addition, the rule is
a + b = b + a
in numbers, this means 2 + 3 = 3 + 2

Answered by Mia
What property justifies:

6a+(2a+8b)
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