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In x ≥ 0, y ≥ 0, x ≤ 4, y ≤ 3, x + y ≤ 8, which inequality is redundant?

Answer and explanation

Correct answer: x + y ≤ 8

The governing concept is redundancy in a system of linear inequalities. An inequality is redundant when every point satisfying the other restrictions automatically satisfies it, so removing it does not enlarge or change the feasible region. From x ≤ 4 and y ≤ 3, adding the upper bounds gives x + y ≤ 4 + 3 = 7. Thus every feasible point already satisfies x + y ≤ 7, which is stronger than x + y ≤ 8. The condition x + y ≤ 8 therefore eliminates no additional point and is redundant, making option C correct. The non-negativity conditions and the separate upper bounds still impose independent restrictions. The conclusion follows from the two upper bounds alone and does not require a complete graph.

Related tags

Linear InequalitiesGraphical SolutionRedundant ConstraintFeasible RegionGraphical Solution Of Linear Inequalities In Two VariablesMathematicsClass 11 Mcq

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