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What is the solution of the inequality (\frac{2x-5}{4}+1\geq3)?

Answer and explanation

Correct answer: (x\geq\frac{13}{2})

The direct answer is A: x≥13/2. Start with (2x−5)/4+1≥3. Subtract 1 from both sides: (2x−5)/4≥2. Multiply both sides by 4. Since 4 is positive, the inequality sign stays the same: 2x−5≥8. Add 5: 2x≥13. Divide by 2, again positive, so x≥13/2. Option A is correct and includes equality because the original sign is ≥. Option B, x≤13/2, reverses the direction without a valid reason; division was by positive 2. Option C, x≥7/2, comes from an arithmetic error, usually forgetting that 5 must be added after multiplying. Option D, x≤7/2, has both the wrong boundary and wrong direction. A quick check with x=13/2 gives left side 3, so equality is accepted. A value smaller than 13/2, such as x=6, gives a value below 3 and fails. Memory cue: reverse an inequality only when multiplying or dividing by a negative number.

Related tags

Linear-InequalitiesFractionAlgebraic-Solution

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