The slack on a binding constraint will always be zero.

Name: The slack on a binding constraint will always be zero.
Brand: Quizplus
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Quizplus · Accepted Answer

Slack is the amount by which the left-hand side of a constraint can increase or decrease without affecting the optimal solution, when the right-hand side is fixed. If a constraint is binding (i.e., its left-hand side equals its right-hand side in the optimal solution), then the slack is zero. Therefore, if a constraint has slack, it is not binding.

The Slack on a Binding Constraint Will Always Be Zero