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If the inequality (kx-6\le 2x+3) has solution (x\ge -3), what is the value of (k)?

Answer and explanation

Correct answer: \(k=-1\)

Rearranging the inequality gives \((k-2)x\le 9\). For the solution to be \(x\ge -3\), the coefficient of \(x\) must be negative. Using the boundary value \(x=-3\), we get \((k-2)(-3)=9\), so \(k-2=-3\) and hence \(k=-1\). If \(k=1\), the solution is \(x\ge -9\), so it is not correct. Exam tip: when dividing an inequality by a negative number, reverse the inequality sign.

Related tags

Linear InequalitiesOne VariableAlgebraic SolutionClass 11Inequality ReversalAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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