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Which interval form represents the solution of 3x + 1 > 10?

Answer and explanation

Correct answer: (3, ∞)

The governing concept is the algebraic solution of a strict linear inequality and its representation in interval notation. Start with 3x + 1 > 10. Subtract 1 from both sides to obtain 3x > 9, and divide by the positive number 3, giving x > 3. Because the inequality is strict, x = 3 is not included in the solution set, so a round or open bracket is required at 3. The solution continues without bound toward positive infinity, which is always written with a parenthesis. Therefore option A, (3, ∞), is correct. Option B incorrectly includes 3, while options C and D describe values less than 3.

Related tags

Linear InequalitiesInterval NotationOpen IntervalAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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