Answer:
4b
Step-by-step explanation:
9b-5b
Factor out a b
b(9-5)
b(4)
9b - 5b = 4b
so to simplify this you are simply just going to subtract the 5 from the 9. Don't worry about the variable right now.
9 - 5 = 4
add the variable back in to each number, 9b - 5b = 4b
