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

Answer and explanation

Correct answer: (x\ge 3)

The direct answer is option A, \(x\ge 3\). Start with \(\frac{x+5}{4}\ge 2\). Since 4 is positive, multiply both sides by 4 without reversing the inequality: \(x+5\ge 8\). Subtract 5 from both sides: \(x\ge 3\). Thus every real number 3 or greater is a solution, including 3 itself. Option A is correct. Option B, \(x\le 3\), reverses the direction without justification. Option C, \(x\ge 13\), results from adding 5 instead of subtracting 5 after obtaining \(x+5\ge8\). Option D, \(x\le13\), contains both the wrong direction and the wrong number. The inequality sign would reverse only if we multiplied or divided by a negative number; the denominator 4 is positive. Memory cue: multiply by a positive number normally; multiply or divide by a negative number and reverse the inequality sign.

Related tags

Linear-InequalitiesFractional-InequalitySolving

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