In Sec. 12.8, at the end of the subsection on tightening constraints, we indicated that the constraint

Question:

In Sec. 12.8, at the end of the subsection on tightening constraints, we indicated that the constraint 4x1 – 3x2 + x3 + 2x4 ≤ 5 can be tightened to 2x1 – 3x2 + x3 + 2x4 ≤ 3 and then to 2x1 – 2x2 + x3 + 2x4 ≤ 3. Apply the procedure for tightening constraints to confirm these results.