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Which value is a solution of 12 - 3x ≤ 0?

Answer and explanation

Correct answer: x = 4

The governing concept is solving a linear inequality and observing that division by a negative number reverses its sign. From 12 - 3x ≤ 0, subtract 12 from both sides to get -3x ≤ -12. Dividing by -3 changes ≤ into ≥, giving x ≥ 4. Of the listed values, only x = 4 satisfies this condition; 3, 2 and 1 are all less than 4. Equality is allowed because the original sign is ≤, so the endpoint x = 4 belongs to the solution set. Substitution provides a direct check: 12 - 3(4) = 12 - 12 = 0, and 0 ≤ 0 is true. Therefore option A is correct, whereas each other option makes the original inequality false.

Related tags

Linear InequalityBoundary ValueNegative DivisionSolution CheckingAlgebraic Solution Of Linear Inequalities In One VariableLinear InequalitiesMathematicsClass 11 Mcq

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