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Which is the solution of (12 < 4x)?

Answer and explanation

Correct answer: x > 3

The governing concept is solving a one-variable linear inequality by applying the same operation to both sides. Begin with 12 < 4x. Divide both sides by 4, which is positive: 12/4 < 4x/4. Therefore, 3 < x, conventionally written as x > 3. Hence option A is correct. Because the divisor is positive, the inequality sign keeps its direction; it would reverse only if we multiplied or divided by a negative number. Option B incorrectly reverses the relation. Options C and D use 16, which does not result from dividing 12 by 4 and therefore cannot describe the solution. The endpoint x = 3 is excluded because 12 < 12 is false, while x = 4 gives 12 < 16, which is true.

Related tags

Linear InequalitiesDivisionOne-Variable SolutionAlgebraic InequalityMathematicsClass 11 McqAlgebraic Solution Of Linear Inequalities In One Variable

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