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What is the correct solution of 3 - 2x ≤ 9?

Answer and explanation

Correct answer: x ≥ -3

The governing concept is sign reversal when an inequality is divided by a negative number. Start with 3 − 2x ≤ 9. Subtract 3 from both sides to get −2x ≤ 6. To isolate x, divide both sides by −2. Since −2 is negative, the inequality symbol reverses, giving x ≥ −3. Option A is therefore correct. A substitution check supports this: x = 0 gives 3 ≤ 9, which is true, and 0 is indeed at least −3. However, x = −4 gives 11 ≤ 9, which is false, and −4 does not satisfy x ≥ −3. Option B is the common error of forgetting sign reversal; options C and D use an incorrect boundary or direction.

Related tags

Linear InequalitiesNegative CoefficientSign ReversalClass 11 MathematicsAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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