x+y≥5
x≥2021
y≥2020
100x+400y
x≥0
3x-4y≤7
50y+30x
3x+2y=10
10x-5y=2
4x+2y=7
2x-3y=5
x+3y≥4
2x+y≤3
x+y=2
y≥0
2x+5y
x+y
