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If x+2y ≤ 10, x+y ≥ 6, and y ≥ 1, what is the position of (4,2)?

Answer and explanation

Correct answer: Only on the boundary x+y=6

The governing concept is feasibility in a system of linear inequalities: a point belongs to the solution region only when it satisfies every inequality, and equality places it on the corresponding boundary. Substitute (x,y)=(4,2). We obtain x+2y=4+2(2)=8≤10, x+y=4+2=6≥6, and y=2≥1, so the point is feasible. Because x+y is exactly 6, the point lies on the boundary line x+y=6. It is not on x+2y=10, since the value is 8 rather than 10, and it is not on y=1, since y=2. Thus it lies on exactly one listed boundary, so option C is correct. Option A wrongly excludes equality, B ignores the satisfied inequalities, and D uses the wrong boundary.

Related tags

Linear InequalitiesBoundary ClassificationPoint TestingSolution RegionGraphical Solution Of Linear Inequalities In Two VariablesMathematicsClass 11 Mcq

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