SAT Math · Linear inequalities in one or two variables · medium

Which inequality is equivalent to |x - 5| ≤ 3?

Which inequality is equivalent to ∣x−5∣≤3|x - 5| \leq 3?

Answer and explanation

Answer: A: 2 ≤ x ≤ 8

The inequality ∣x−5∣≤3|x - 5| \leq 3 says the distance from xx to 5 is at most 3. So xx lies between 5−35 - 3 and 5+35 + 3, which gives 2≤x≤82 \leq x \leq 8, choice A. Equivalently, −3≤x−5≤3-3 \leq x - 5 \leq 3, then add 5 to all three parts. Choice B (−2≤x≤8-2 \leq x \leq 8) adds 5 to the right bound but mishandles the left, getting −2-2 instead of 2. Choice C (2≤x≤32 \leq x \leq 3) uses 3 as the upper bound without adding 5. Choice D describes the outside of the interval, which would be the solution of ∣x−5∣≥3|x - 5| \geq 3.

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