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What is the solution of the inequality (\frac{x-1}{4}\ge 2)?

Answer and explanation

Correct answer: (x\ge 9)

The direct answer is A: \(x\ge9\). Start with \((x-1)/4\ge2\). Multiply both sides by 4. Since 4 is positive, the inequality direction remains unchanged: \(x-1\ge8\). Add 1 to both sides: \(x\ge9\). Thus A is correct, and x=9 is included because the original sign is \(\ge\); substitution gives \((9-1)/4=2\). Option B, \(x\le9\), reverses the direction and is false for x=10, which satisfies the original inequality. Option C, \(x>9\), wrongly excludes the valid boundary x=9. Option D, \(x<9\), has both the wrong direction and excludes valid larger values. The denominator 4 is positive, so no sign reversal occurs. If the multiplier or divisor had been negative, the sign would have to reverse. Memory cue: positive multiplication keeps the sign; negative multiplication flips it.

Related tags

Linear InequalitiesFractionsGreater Than Equal

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