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If the solution of the inequality \(x+2<k\) is \(x<7\), what is the value of \(k\)?

Answer and explanation

Correct answer: 9

Solving \(x+2<k\) for \(x\) gives \(x<k-2\). Comparing this with the given solution \(x<7\), we get \(k-2=7\), so \(k=9\). The value 7 is the boundary of the solution set, not the value of \(k\). Exam tip: first isolate the variable and then compare the resulting boundary values.

Related tags

Linear InequalitiesParameter ValuesSolution SetAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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