Could someone help me with this ?

The capacity in pounds of the lift used by a roofing company to place roofing shingles and buckets of

roofing nails on rooftops is modeled by the formula shown, where S represents packs of shingles and B

represents buckets of nails. Use the formula to find (a) the largest number of shingle packs that can be

lifted, (b) the largest number of nail buckets that can be lifted, and (c) the largest number of shingle

packs that can be lifted along with three nail buckets.