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What is the solution of the inequality 13 < 3x + 1?

Answer and explanation

Correct answer: x > 4

The governing concept is isolating the variable while preserving the inequality direction under positive operations. Start with 13 < 3x + 1. Subtract 1 from both sides to obtain 12 < 3x. Divide both sides by the positive number 3; the sign does not reverse, so 4 < x, equivalently x > 4. Hence option A is correct. The inequality is strict, so x = 4 is not included: substituting it gives 13 < 13, which is false. Option B reverses the direction, while options C and D incorrectly introduce an equality sign. A test value such as x = 5 gives 13 < 16, confirming that values greater than 4 belong to the solution set.

Related tags

Linear InequalitiesPositive DivisionStrict InequalitySolution SetAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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