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Why is \(x=7\) included in the solution of the inequality \(2x-5\leq 9\)?

Answer and explanation

Correct answer: Because \(x\leq 7\)

Solving the inequality gives \(2x-5\leq 9\), so \(2x\leq 14\) and therefore \(x\leq 7\). Thus, \(x=7\) belongs to the solution set because \(\leq\) means ‘less than or equal to’, which includes equality. Option A is incorrect because \(x<7\) excludes \(x=7\). Exam tip: The boundary value is included when the inequality sign is \(\leq\) or \(\geq\).

Related tags

Linear InequalitiesOne Variable InequalitiesBoundary ValuesInequality SymbolsAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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