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If the solution of ( kx-3\leq 9 ) is (x\leq 4) and (k>0), what is (k)?

Answer and explanation

Correct answer: 3

From \(kx-3\leq 9\), we get \(kx\leq 12\). Since \(k>0\), dividing by \(k\) does not reverse the inequality, so \(x\leq \frac{12}{k}\). The given solution is \(x\leq 4\); hence \(\frac{12}{k}=4\), giving \(k=3\). If \(k=4\), the boundary would be \(x\leq 3\), so it is not correct. Exam tip: dividing an inequality by a positive number keeps its sign unchanged, while dividing by a negative number reverses it.

Related tags

Linear InequalitiesOne VariableParameterAlgebraic SolutionClass 11Algebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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