Consider: A farmer can plant up to 20 acres of land with wheat and barley. He can earn $8,000 for every acre he plants with wheat and $5,000 for every acre he plants with barley. His use of a necessary pesticide is limited by federal regulations to 10 gallons for his entire 20 acres. Wheat requires 2 gallons of pesticide for every acre planted and barley requires just 1 gallon per acre.

Problem: What is the maximum profit he can make?

Assumptions: let x = the number of acres of wheat let y = the number of acres of barley

Which of the following is a valid constraint for this problem?

Select one: a. y <= 10 - 2x b. x <= 0 c. x <= 10 - x d. y <= 20 - 2x