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What is the solution of the inequality 2(x − 5) ≤ 8?

Answer and explanation

Correct answer: x ≤ 9

The governing concept is equivalence in solving a linear inequality: the same operation may be applied to both sides, and division by a positive number leaves the inequality sign unchanged. Divide 2(x − 5) ≤ 8 by 2 to obtain x − 5 ≤ 4. Adding 5 to both sides gives x ≤ 9. Therefore option A is correct. The endpoint 9 must be included because the original relation is ≤; direct substitution gives 2(9 − 5) = 8, which is true. Options B and D place the solution on the wrong side of 9, while option C incorrectly excludes the valid boundary value. The complete solution is every real number less than or equal to 9.

Related tags

Linear InequalitiesAlgebraic SolutionPositive DivisionClosed EndpointAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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