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What is the solution of the inequality 9x − 5 ≥ 4x + 20?

Answer and explanation

Correct answer: x ≥ 5

The governing concept is collecting variable terms on one side and constants on the other while preserving the inequality. Begin with 9x − 5 ≥ 4x + 20. Subtract 4x from both sides to get 5x − 5 ≥ 20. Add 5 to both sides, giving 5x ≥ 25. Dividing by positive 5 does not change the direction, so x ≥ 5. The equality is retained because the original sign is ≥. Substitution confirms the boundary: when x = 5, both sides equal 40. A larger value, such as x = 6, satisfies the relation, while x = 4 gives 31 ≥ 36, which is false. Option B reverses the direction, and options C and D incorrectly exclude or reverse the boundary. Thus option A is the complete solution.

Related tags

Linear InequalitiesVariables On Both SidesGreater Than Or EqualAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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