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Which is the solution of (\frac{2x-1}{3}\geq 5)?

Answer and explanation

Correct answer: (x\geq 8)

The direct answer is option A: x≥8. Start with (2x-1)/3≥5. Since 3 is positive, multiply both sides by 3 without changing the sign: 2x-1≥15. Add 1: 2x≥16. Divide by positive 2: x≥8. A is correct, and x=8 is included because the original sign is ≥; substitution gives (16-1)/3=5. B, x≤8, reverses the direction incorrectly. C, x>8, wrongly excludes x=8, even though equality works. D, x<8, has the opposite direction and also excludes larger valid values such as x=9. The denominator is positive, so no sign reversal occurs when clearing it. If the denominator had been negative, reversal would be necessary. Memory cue: positive multiplication or division keeps the inequality sign; check the boundary separately.

Related tags

Linear InequalitiesFractionDenominator

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