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If the point ((k,2)) is a solution of both \(2x+y\leq 10\) and \(x-y>1\), which range of (k) is correct?

Answer and explanation

Correct answer: \(3<k\leq 4\)

Substituting \((k,2)\) into the first inequality gives \(2k+2\leq10\), so \(k\leq4\). The second inequality gives \(k-2>1\), so \(k>3\). The common range is \(3<k\leq4\), hence option B is correct. At \(k=3\), the second strict inequality is not satisfied. Exam tip: take the intersection of the ranges obtained from all inequalities.

Related tags

Linear InequalitiesTwo VariablesPoint SubstitutionParameter RangeGraphical SolutionGraphical Solution Of Linear Inequalities In Two VariablesMathematicsClass 11 Mcq

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