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In the solution region of \(x+2y\leq 8\), \(x\geq 1\), and \(y\geq 1\), what is the maximum value of (x)?

Answer and explanation

Correct answer: (6)

The direct answer is option A, 6. We want x to be as large as possible. The constraint y≥1 says the smallest allowed y is 1. Since x+2y≤8, replacing y by its smallest value gives x+2(1)≤8, so x+2≤8 and x≤6. This bound is attainable at (6,1), which satisfies x≥1, y≥1, and x+2y=8. Hence the maximum is 6. Option A, 6, works exactly at the boundary. Option B, 7, would give 7+2=9>8, so it is not feasible. Option C, 8, would give 10>8 and is also impossible. Option D, 5, is feasible, for example with y=1, but it is not the maximum because 6 is feasible. The key idea is that increasing y consumes two units of the allowance, so for maximum x we choose the smallest permitted y. Exam cue: for a positive coefficient of y in an upper-bound inequality, minimize y when maximizing x.

Related tags

Linear InequalitiesMaximum XFeasible RegionGraphical Range

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