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What type of feasible region is formed by (x\ge 0), (y\ge 0), (x+y\le 8)?

Answer and explanation

Correct answer: Bounded triangle in first quadrant

The feasible region is a bounded triangle in the first quadrant, so A is correct. The inequalities x≥0 and y≥0 restrict points to the first quadrant, including the axes. The inequality x+y≤8 means points on or below the line x+y=8 are allowed. This line meets the x-axis at (8,0) and the y-axis at (0,8), while the axes meet at (0,0). Therefore the region has vertices (0,0), (8,0), and (0,8), a closed bounded triangle. B is wrong because the second quadrant has x<0. C is wrong because x+y≤8 cuts off part of the first quadrant. D is wrong because (0,0), for example, satisfies all inequalities. Memory cue: nonnegative x and y mean first quadrant; a ≤ line often closes a bounded region.

Related tags

Feasible RegionFirst QuadrantBounded

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