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Which is the correct number line representation of (-2\le 3x+1<10)?

Answer and explanation

Correct answer: ([-1,3))

The direct answer is option A: the interval is [-1,3). Start with -2≤3x+1<10. Subtract 1 from all three parts: -3≤3x<9. Divide all parts by positive 3, so the inequality signs do not change: -1≤x<3. The left endpoint is included because equality is allowed at -1, so it is shown with a closed point or square bracket. The right endpoint is excluded because the sign is <, so it is shown with an open point or round bracket. Option A matches exactly. Option B reverses both endpoint inclusions and is wrong. Option C uses the original bounds -2 and 10 without solving for x. Option D describes outside the interval and also uses incorrect endpoint directions. Exam cue: for a positive divisor, keep the signs; use square brackets for ≤ and round brackets for <.

Related tags

Linear InequalitiesCompound InequalityInterval

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