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Solve the inequality (\frac{x+7}{3}-\frac{2x-1}{4}\ge 0).

Answer and explanation

Correct answer: \(x\le \frac{31}{2}\)

Multiplying by 12 does not reverse the inequality because 12 is positive: \(4(x+7)-3(2x-1)\ge 0\). This gives \(4x+28-6x+3\ge 0\), or \(31-2x\ge 0\). Hence \(2x\le 31\), so \(x\le \frac{31}{2}\). The closest distractor is \(x\ge \frac{31}{2}\), but the negative coefficient of \(x\) must be handled carefully while rearranging. Exam tip: reverse an inequality sign only when multiplying or dividing by a negative number.

Related tags

Linear InequalitiesOne VariableFractional InequalitiesAlgebraic SolutionClass 11 MathematicsAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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