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Which point is a solution of (2x+y\geq 7), (x+2y\leq 12), (x\geq 0), and (y\geq 0)?

Answer and explanation

Correct answer: ((3,3))

The direct answer is option B, (3,3). A point is a solution only if it satisfies every inequality, including non-negativity. Test option A, (1,2): 2x+y=4, which is less than 7, so it fails the first condition. Test option B, (3,3): 2x+y=6+3=9≥7, and x+2y=3+6=9≤12; both coordinates are non-negative, so it works. Test option C, (5,4): 2x+y=14≥7, but x+2y=13>12, so it fails the second condition. Test option D, (0,6): 2x+y=6<7, so it fails the first condition, even though x+2y=12. Therefore only option B is a solution. The safe method is substitution: calculate both left sides separately and then check the signs and coordinate restrictions. Memory cue: satisfying one inequality is not enough; a solution must pass all four tests.

Related tags

Linear InequalitiesPoint TestingSolution RegionFirst Quadrant

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