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Solve the compound inequality (-5<2-\frac{x}{3}\le 4).

Answer and explanation

Correct answer: \(-6\le x<21\)

Solve the compound inequality in two parts. From \(-5<2-\frac{x}{3}\), we get \(-7<-\frac{x}{3}\); multiplying by \(-3\) reverses the inequality, giving \(x<21\). From \(2-\frac{x}{3}\le4\), we get \(-\frac{x}{3}\le2\), hence \(x\ge-6\). Their common solution is \(-6\le x<21\). Option C has the endpoint signs reversed. Exam tip: always reverse an inequality sign when multiplying or dividing by a negative number.

Related tags

Linear InequalitiesCompound InequalitiesOne VariableNegative CoefficientClass 11 MathematicsAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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