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What is the solution of 4x≥20?

Answer and explanation

Correct answer: x≥5

A linear inequality is solved much like an equation, but the effect of an operation on the inequality sign must be remembered. Dividing or multiplying both sides by a positive number keeps the inequality direction unchanged; only multiplication or division by a negative number reverses it. Starting with 4x≥20, divide both sides by the positive number 4: 4x/4≥20/4, so x≥5. Thus every number 5 or greater satisfies the original inequality, while a number below 5 does not. Substitution confirms the boundary: x=5 makes both sides equal to 20. Therefore option A is correct. Options B and D reverse the direction without cause, while C incorrectly subtracts 4 rather than dividing by 4.

Related tags

Linear InequalitiesSolving InequalitiesPositive DivisionIntroduction To InequalitiesMathematicsClass 11 Mcq

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