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What is the range of (y) in the solution region (x\geq 0), (y\geq 0), (x+3y\leq 12), and (x+y\geq 4)?

Answer and explanation

Correct answer: (0\leq y\leq 4)

The direct answer is option C, 0≤y≤4. From x≥0 and x+3y≤12, we have 3y≤12, so y≤4. Together with y≥0, this gives 0≤y≤4. Both endpoints are attainable: when y=0, choose x=4, which satisfies x+y≥4 and x+3y≤12; when y=4, choose x=0, which satisfies x+y=4 and x+3y=12. Thus the range is closed, including 0 and 4. Option A, 1≤y≤4, incorrectly excludes the feasible point y=0. Option B, 0<y<4, incorrectly excludes both feasible boundary values. Option C, 0≤y≤4, includes exactly every possible value. Option D, 2≤y≤6, has an incorrect lower bound and exceeds the upper bound. A useful method is to use x≥0 to obtain the largest possible y, then check whether the lower endpoint is allowed by the other conditions. Memory cue: inequalities with ≤ and ≥ usually allow their boundary values.

Related tags

Linear InequalitiesRange Of YFeasible RegionGraphical Solution

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