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Where will the common solution region of 2x + y ≤ 4, x ≥ 0, and y ≥ 0 lie?

Answer and explanation

Correct answer: In the first quadrant below the boundary line

The boundary line of 2x + y ≤ 4 is 2x + y = 4. Its intercepts are (2, 0), obtained by putting y = 0, and (0, 4), obtained by putting x = 0. Testing the origin gives 2(0) + 0 = 0 ≤ 4, so the required side is the side containing the origin, below the line. The restrictions x ≥ 0 and y ≥ 0 limit the points to the first quadrant and include the coordinate axes. Hence the common solution is the closed triangular region with vertices (0, 0), (2, 0), and (0, 4). Therefore option A is correct. The other options either use a wrong quadrant, the wrong side of the line, or an unnecessarily large region.

Related tags

Linear-InequalitiesGraphical-SolutionFirst-QuadrantLinear InequalitiesGraphical Solution Of Linear Inequalities In Two VariablesMathematicsClass 11 Mcq

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