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If the point ((2,k)) is a solution of both \(x+y\leq 7\) and \(2x-y<3\), which condition is correct for (k)?

Answer and explanation

Correct answer: \(1<k\leq 5\)

Substituting \((2,k)\) into the first inequality gives \(2+k\leq 7\), so \(k\leq 5\). From the second inequality, \(2(2)-k<3\Rightarrow 4-k<3\Rightarrow -k<-1\), hence \(k>1\). Combining both conditions gives \(1<k\leq 5\). Option B incorrectly includes \(k=1\); at \(k=1\), \(2x-y=3\), which does not satisfy \(<3\). Exam tip: reverse the inequality sign when multiplying or dividing by a negative number.

Related tags

Linear InequalitiesTwo VariablesParameter KSolution RegionStrict InequalityGraphical Solution Of Linear Inequalities In Two VariablesMathematicsClass 11 Mcq

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