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If (\frac{x-a}{2}\le 3) has solution (x\le10), what is (a)?

Answer and explanation

Correct answer: 4

Multiplying both sides by the positive number 2 does not reverse the inequality sign: \(x-a\le 6\). Hence, \(x\le a+6\). Since the given solution is \(x\le 10\), we get \(a+6=10\), so \(a=4\). If 6 were chosen, the boundary would be \(x\le 12\), not the given one. Exam tip: Multiplying or dividing an inequality by a positive number leaves its sign unchanged.

Related tags

Linear InequalitiesOne VariableAlgebraic SolutionClass 11 MathematicsInequality PropertiesAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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