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If k > 0 and a ≤ b, which conclusion is correct?

Answer and explanation

Correct answer: ka ≤ kb

The relevant principle is the multiplication property of inequalities. Multiplying both sides of a ≤ b by a positive number keeps the inequality direction unchanged. Since k > 0, multiplying by k gives ka ≤ kb, so option B is correct. Option A would be appropriate only if multiplication by a negative number caused a reversal, but k is explicitly positive. Option C is too strong: a and b need not be equal, so their products need not be equal. Adding k to both sides would also preserve direction and yield a + k ≤ b + k, not the reversed statement in option D. Therefore the only conclusion guaranteed for every allowed a, b, and positive k is B.

Related tags

Linear InequalitiesPositive MultiplierOrder PropertiesClass 11 MathematicsIntroduction To InequalitiesMathematicsClass 11 Mcq

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