Consider the following all-integer linear program.
Max 1x₁ + 1x₂
s.t.
4x₁ + 7x₂ ≤ 39
1x₁ + 5x₂ ≤ 15
2x₁ + 1x₂ ≤ 17
x₁, x₂ ≥ 0 and integer
(a) Graph the constraints for