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Which interval is the solution of ( -4\leq \frac{x-1}{3}<2 )?

Answer and explanation

Correct answer: \(-11\leq x<7\)

Since 3 is positive, multiplying every part of the compound inequality by 3 does not reverse the inequality signs: \(-12\leq x-1<6\). Adding 1 to all three parts gives \(-11\leq x<7\). Hence, option A is correct. Option B incorrectly stops before adding 1 to isolate \(x\). Exam tip: In a compound inequality, apply each operation to the left, middle, and right parts alike.

Related tags

Linear InequalitiesCompound InequalityInterval NotationOne VariableAlgebraic SolutionAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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