Which Expression is equivalent to 2b - 3a +b +a?
A. b-2a
B. b-4a
C. 3b -4a
D. 3b-2a
I think its d but I don't get where the extra +a and +b would go if that was the case... Can anyone explain?

Question

Which Expression is equivalent to 2b - 3a +b +a?
A. b-2a
B. b-4a
C. 3b -4a
D. 3b-2a
I think its d but I don't get where the extra +a and +b would go if that was the case... Can anyone explain?

anonymous · Answer

2b - 3a + b + a
combine like terms:
2b + b = 3b
-3a + a = -2a
leaving us with : 3b - 2a
your right...it is D

anonymous · Answer

when there is just a letter - such as "a", it means "1a"

anonymous · Answer

Whenever there is a letter by itself, imagine there is a one in front of it.

anonymous · Answer

Yeah I know that but I was thinking it would add the 2a^2 but thanks :D

anonymous · Answer

glad to help....when adding like terms, the variables stay the same..
3a + 2a = 5a
15a - 12a = 3a
well...you see what I mean