A farmer can spend no more than $4,000 on fertilizer and seeds. The fertilizer costs $2
per pound and seeds cost $20 per pound.
To summarize the situation, the farmer writes the inequality:
2f + 209 ≤ 4,000, where f is the number of pounds of fertilizer and S is the number
of pounds of seeds.
Which graph's shaded region shows the possible combinations of fertilizer and seeds
the farmer can buy?