Mike bakes biscuits. He used 1/4 cup of flour to coat the countertop and the rolling pin. He also used 2 1/2 cups of flour for each batch of biscuits he bakes. If he uses 7 3/4 cups of flour in all, how many batches of biscuits does he bake? Need the algebraic equation for the problem and I also need to figure out b = ___ batches of biscuits