A farmer is going to divide her 30 acre farm between two crops. Seed for crop A costs $10 per acre. Seed for crop B costs $5 per acre. The farmer can spend at most $250 on seed.
If crop B brings in a profit of $60 per acre, and crop A brings in a profit of $80 per acre, how many acres of each crop should the farmer plant to maximize her profit? Let x be the number of crop A and
y be the number of crop B.