collect like terms
11a+7b-5a-9b
11a+7b-5a-9b= 4
Is this correct?
I don't know where you got 4.
collect like terms
11a+7b-5a-9b
6a - 2b
To collect like terms, you need to combine the terms that have the same variables. In this case, we have terms with variables 'a' and 'b', so let's group them together:
11a - 5a = (11 - 5)a = 6a
7b - 9b = (7 - 9)b = -2b
Now we can combine the simplified terms:
6a - 2b
Therefore, the fully simplified expression is 6a - 2b, not 4 as you mentioned.