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Which is the correct solution of the inequality 4x − 9 ≤ 2x + 7?

Answer and explanation

Correct answer: x ≤ 8

The governing concept is preservation of an inequality while performing equivalent algebraic operations. Start with 4x − 9 ≤ 2x + 7. Subtract 2x from both sides to obtain 2x − 9 ≤ 7. Add 9 to both sides, giving 2x ≤ 16. Dividing by the positive number 2 does not reverse the inequality sign, so x ≤ 8. Therefore option A is correct. The endpoint 8 is included because the original symbol is ≤; substituting x = 8 gives 32 − 9 = 23 and 16 + 7 = 23. Options B and D reverse the direction incorrectly, while option C excludes the valid endpoint and uses a strict inequality.

Related tags

Linear InequalitiesAlgebraic SolutionInequality SignNumber LineAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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