Which equation represents the relationship between b and f described below? Anna likes to make biscuits. She uses 8 and 3/4 cups of flour to make 5 batches of biscuits. Tyler also wants to make biscuits using the same recipe. He will bake b batches of biscuits using f cups of flour.

a) b = 4/7f
b) b = 7/4 f
c) b = 2/7 f
d) b = 7/2 f

please elaborate and show work.