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What are the vertices of the solution region of x ≥ 1, y ≥ 0, x + 2y ≤ 7, and 2x + y ≤ 8?

Answer and explanation

Correct answer: (1, 0), (4, 0), (3, 2), (1, 3)

The governing concept is the graphical solution of simultaneous linear inequalities: the feasible region is the common part of all four half-planes, and its vertices occur at boundary intersections that satisfy every inequality. On y = 0, the restrictions give x ≥ 1, x ≤ 7, and x ≤ 4, so the relevant endpoints are (1, 0) and (4, 0). The two slanting boundaries intersect by solving x + 2y = 7 and 2x + y = 8, which gives (x, y) = (3, 2). On x = 1, the first slant boundary gives y = 3, while the second permits y = 6; hence (1, 3) is the limiting feasible point. Therefore option C is correct. Option A incorrectly uses (7, 0), which violates 2x + y ≤ 8; the other options contain points outside the feasible region.

Related tags

Linear InequalitiesGraphical SolutionVerticesFeasible RegionGraphical Solution Of Linear Inequalities In Two VariablesMathematicsClass 11 Mcq

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