Posted by **Hannah** on Monday, February 7, 2011 at 7:36pm.

What property justifies that 3y+9 = 9+3y

- Algebra 1 -
**helper**, Monday, February 7, 2011 at 7:54pm
3y + 9 = 9 + 3y

Commutative Property

For addition, the rule is

a + b = b + a

in numbers, this means 2 + 3 = 3 + 2

- Algebra 1 -
**Mia**, Monday, December 5, 2011 at 5:04pm
What property justifies:

6a+(2a+8b)

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