So what I have to do is say which property justifies each step, this is what I put and my teacher said I got it wrong... could someone please help me?

Question

question~ 3. (6a + 2a) +8b = (6 + 2)a + 8b

Answer~ Associative property of addition

Answer 1

better review the distributive property.

associative would be (6a+2a)+8b = 6a+(2a+8b)

Answer 2

Thank you so much! Distributive property is what I thought it would be but I wasn't sure because the "a" wasn't in the parenthesis.
I really appreciate your help!