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For what (a) does the inequality (ax+4>2x+a) have solution (x<3)?

Answer and explanation

Correct answer: \(a=1\)

Rearranging the inequality gives \((a-2)x>a-4\). For \(a=1\), this becomes \(-x>-3\). Dividing by a negative number reverses the inequality sign, so \(x<3\). Hence, \(a=1\) is correct. For instance, \(a=3\) gives \(x>-1\), not the required solution. Exam tip: Always reverse an inequality sign when multiplying or dividing by a negative quantity.

Related tags

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

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