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For the solution region 2x+y ≤ 12, x+2y ≤ 12, x ≥ 0, y ≥ 0, what is the maximum value of x+y?

Answer and explanation

Correct answer: 8

The feasible region is bounded by two lines and the coordinate axes, so a linear objective such as x + y reaches its maximum at a corner point. The boundary lines 2x + y = 12 and x + 2y = 12 intersect by subtraction: x − y = 0, hence x = y; substituting gives 3x = 12, so the intersection is (4, 4). The feasible vertices are (0, 0), (6, 0), (4, 4), and (0, 6). Evaluating x + y gives 0, 6, 8, and 6 respectively. Therefore the maximum value is 8 at (4, 4), so option B is correct. Values 10 and 12 exceed the feasible corner values and cannot be attained in the region.

Related tags

Linear InequalitiesGraphical SolutionLinear ProgrammingMaximum ValueGraphical Solution Of Linear Inequalities In Two VariablesMathematicsClass 11 Mcq

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