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For x + y ≤ 9, x + 2y ≥ 8, x ≥ 0, and y ≥ 0, which statement about (9, 0) is correct?

Answer and explanation

Correct answer: It is a solution and lies on a boundary

To classify the point, substitute x = 9 and y = 0 into every inequality. We obtain x + y = 9, so x + y ≤ 9 is true with equality; equality means the point lies on the boundary line x + y = 9. Also, x + 2y = 9 + 0 = 9 ≥ 8, and the non-negativity conditions are satisfied because x = 9 ≥ 0 and y = 0 ≥ 0. In fact, y = 0 places the point on the x-axis as well, which is another boundary of the feasible region. Thus (9, 0) belongs to the solution region and lies on its boundary, rather than in its interior. Therefore option A is correct; options C and D incorrectly claim that valid inequalities fail.

Related tags

Linear InequalitiesBoundary PointFeasible RegionGraphical SolutionGraphical Solution Of Linear Inequalities In Two VariablesMathematicsClass 11 Mcq

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