Answer:
9b + 1
Step-by-step explanation:
Is it 9b + 1 because 10b and the variable b are like terms. There is an invisable 1 in front of the b. So you just do it like this, 10b - 1b + 1, which is 9b + 1. the 1 has no variable, so just leave it alone and that is your answer. I really hope I helped you out!
