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What is the position of ((3,0)) with respect to (3x+y<9)?

Answer and explanation

Correct answer: on boundary but not included

The direct answer is option B: the point is on the boundary but is not included in the solution. Substitute (3,0) into the left side: 3x + y = 3(3) + 0 = 9. Thus the point satisfies the equality 3x + y = 9. However, the inequality is 3x + y < 9, and 9 < 9 is false. Therefore the point is on the boundary line, but the strict inequality excludes the boundary. Option A is wrong because the point does not satisfy the inequality. Option B is correct. Option C is wrong because an inside point would give a value strictly less than 9. Option D is wrong because no point is automatically included; it must be tested. Exam cue: a < or > sign gives a dotted boundary and excludes the line; ≤ or ≥ includes it.

Related tags

Linear InequalitiesStrict InequalityBoundary PointClass 11

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