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If the point ((k,3)) is a solution of both \(x+2y\leq 11\) and \(3x-y>6\), which condition is correct for (k)?

Answer and explanation

Correct answer: \(3<k\leq 5\)

Substituting \((k,3)\) into the first inequality gives \(k+2(3)\leq 11\), so \(k\leq 5\). The second inequality gives \(3k-3>6\), so \(3k>9\) and hence \(k>3\). Combining both conditions gives \(3<k\leq 5\). Option B incorrectly includes \(k=3\), which does not satisfy the second inequality. Exam tip: solve each inequality separately and take their common interval.

Related tags

Linear InequalitiesTwo VariablesSubstitutionParameterGraphical SolutionGraphical Solution Of Linear Inequalities In Two VariablesMathematicsClass 11 Mcq

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