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What is the area of the solution region (x\geq 0), (y\geq 0), (x+2y\leq 12), and (2x+y\leq 12)?

Answer and explanation

Correct answer: (24) square units

The direct answer is option C, 24 square units. The feasible region lies in the first quadrant. On the x-axis, y=0 gives 2x≤12, so the x-intercept is (6,0). On the y-axis, x=0 gives 2y≤12, so the y-intercept is (0,6). The two boundary lines intersect by solving x+2y=12 and 2x+y=12; subtracting gives x-y=0, so x=y, and then 3x=12 gives (4,4). The vertices are (0,0), (6,0), (4,4), and (0,6). Split the shape into two right triangles: the triangle with vertices (0,0),(6,0),(4,4) has area 12, and the triangle with vertices (0,0),(4,4),(0,6) also has area 12; total area is 24. Option A, 18, and option B, 20, are too small. Option C, 24, matches the calculated area. Option D, 30, overestimates the region. Include the boundary because the inequalities are non-strict.

Related tags

Linear InequalitiesGraphical SolutionAreaFeasible Region

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