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What is the solution of the inequality (x-7>-2)?

Answer and explanation

Correct answer: (x>5)

The direct answer is option A: x>5. The aim is to leave x alone. Begin with x-7>-2. Add 7 to both sides: x>-2+7, so x>5. Adding the same number to both sides preserves the order because the distance between the two sides does not change. A is correct and includes values such as 6, which satisfies 6-7>-2 because -1>-2. B, x<5, reverses the required direction; a value such as 4 gives -3>-2, which is false. C, x≥5, wrongly includes the boundary x=5; substitution gives -2>-2, false because the sign is >, not ≥. D, x≤5, has the wrong direction and also includes many invalid values. No sign reversal occurs here because we only add a positive number, not multiply or divide by a negative number. Exam cue: when adding or subtracting, keep the inequality sign unchanged; reverse it only when multiplying or dividing by a negative number.

Related tags

Linear InequalitiesAdditionNegative Constant

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