The shaded region in the figure is the solution set of the inequations
1
4x + 5y ≥ 20, 3x + 10y ≤ 30, x ≤ 6, x, y ≥ 0
2
4x + 5y ≥ 20, 3x + 10y ≤ 30, x ≥ 6, x, y ≥ 0
3
4x + 5y ≤ 20, 3x + 10y ≤ 30, x ≤ 6, x, y ≥ 0
4
4x + 5y ≤ 20, 3x + 10y ≤ 30, x ≥ 6, x, y ≥ 0