Answer:
A., E., and F.
Explanation:
4x + 5y ≤ 2000
plug in the values from the possible answers:
try: 4(500) + 5(0) ≤ 2000, 2000 + 0 = 2000 (=2000, counts, so A. is right)
try: 4(0) + 5(500) ≤ 2000, 0 + 2500 = 2500 (above 200, not B.)
try: 4(300) + 5(200) ≤ 2000, 1200 + 1000 = 2200 (above 200, not C.)
try: 4(200) + 5(350) ≤ 2000, 1750 + 800 = 2550 (above 200, not D.)
try: 4(100) + 5(200) ≤ 2000, 400 + 1000 = 1400 (<2000, counts, so E. is right)
try: 4(0) + 5(400) ≤ 2000, 0 + 2000 = 2000 (=2000, counts, so F. is right)