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If (x ≤ 2), which statement is correct after multiplying both sides by (−3)?

Answer and explanation

Correct answer: −3x ≥ −6

The governing property is order reversal under multiplication by a negative number. Starting with x ≤ 2, multiply each side by −3. Because −3 is negative, the inequality sign changes from ≤ to ≥: (−3)x ≥ (−3)(2), hence −3x ≥ −6. Therefore option B is correct. Option A performs the multiplication but forgets the reversal. Option C changes the coefficient to positive 3 without justification, and option D changes the right-hand product incorrectly. A numerical check supports the result: x = 2 gives equality, −6 ≥ −6; x = 1 gives −3 ≥ −6, which is true. Thus the transformed inequality is equivalent to the original one.

Related tags

Linear InequalitiesNegative MultiplicationOrder ReversalRepresentation On Number LineMathematicsClass 11 Mcq

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