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Which statement is equivalent to (x\leq 5)?

Answer and explanation

Correct answer: (5\geq x)

The direct answer is A: 5≥x. The statement x≤5 says that x is less than or equal to 5. Reversing the order of the two sides gives the equivalent statement 5≥x; the meaning does not change. For example, x=5 satisfies both, and x=2 also satisfies both. A is correct because “x is at most 5” means “5 is at least x.” B, 5<x, means x<5 and excludes x=5, so it is not equivalent. C, x>5, describes values greater than 5, the opposite direction. D, 5≤x, means x≥5 and includes values greater than or equal to 5, also the reverse inequality. Note that merely changing sides changes the visible direction of the sign, but it does not mean multiplying by a negative number. The boundary value 5 must remain included because the original sign is ≤. Memory cue: read ≤ as “at most”; reversing sides changes it to ≥.

Related tags

Equivalent-InequalityNotationConcept

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