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If (x) is real and (2x+1\geq 7) and (x-4<3), what is the combined solution?

Answer and explanation

Correct answer: (3\leq x<7)

Direct answer: option A, 3≤x<7. Solve each inequality separately. From 2x+1≥7, subtract 1 on both sides: 2x≥6. Divide by the positive number 2: x≥3; the inequality sign stays the same. From x-4<3, add 4: x<7. The word “and” means both conditions must hold at once, so take their overlap: x is at least 3 but less than 7, written 3≤x<7. Option A is correct. Option B reverses which endpoint is included and excluded. Option C keeps only x≥7, which does not follow and misses values such as 4. Option D keeps only x<3, which contradicts the first inequality and misses valid values such as 3. On a number line, use a closed dot at 3 and an open dot at 7.

Related tags

System-Of-InequalitiesIntersectionReal-Solution

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