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If (-3x+5\ge -7) and (x+2>0), find the common solution set.

Answer and explanation

Correct answer: (-2<x\le 4)

Solve each inequality separately and then take the values common to both results. From \\(-3x+5\ge -7\\), subtract 5 to get \\(-3x\ge -12\\). Dividing by the negative number \\(-3\\) reverses the inequality sign, giving \\(x\le 4\\). From \\(x+2>0\\), subtract 2 to obtain \\(x>-2\\). Both conditions must hold at the same time, so the solution is \\(-2<x\le4\\).

Option D states exactly this common solution set. The endpoint \\(-2\\) is excluded because the second inequality is strict: at \\(x=-2\\), it gives 0>0, which is false. The endpoint 4 is included because the first inequality allows equality, and the second inequality is also satisfied there. Reversing the sign while dividing by \\-3 would incorrectly produce another option.

Related tags

Linear InequalitiesIntersectionOne Variable

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