6a+3b+2a-4a+6b+8+b-1

Question

 Combine like terms

Answer 1

Like terms have the same variable (a or b) or they are constants (8 or -1).  So,  all the "a" terms are 6a, 2a, and -4a.  Add all of these "a" terms together:  6a + 2a - 4a = 8a - 4a = 4a.

 

All of the "b" terms are 3b, 6b, and b.  Add all of these like terms together.  What do you get?

 

Now add the constant terms (8 and -1) together: 8 - 1 = 7.

 

So, the answer is 4a + (whatever you got when you added the "b" terms together) + 7.