3

Set 12: Linear Inequalities

Explanation

Answer: A

Solve: 5<32x9-5 < 3 - 2x \leq 9

A.

3x<4-3 \leq x < 4

✓ Correct
B.

3<x4-3 < x \leq 4

C.

4x<3-4 \leq x < 3

D.

4<x34 < x \leq -3

Detailed Explanation

Choice A is correct. Choice A is the correct answer. Isolate xx and reverse signs. 1. Subtract 3: 8<2x6-8 < -2 x \leq 6 2. Divide by -2: 4>x34> x \geq -3 (Reverse signs!) 3. Rewrite: 3x<4-3 \leq x < 4 Strategic Tip: When rewriting 4>x34> x \geq -3, start with the smallest number: 3x<4-3 \leq x < 4. Choice B is incorrect because it swaps the strict/inclusive endpoints. Choice C is incorrect because it calculates endpoints incorrectly. Choice D is incorrect because it writes the interval backwards (4<34< -3 is impossible).

Key Steps:

The correct answer is 3x<4-3 \leq x < 4

Why others are wrong:
B: Choice B is incorrect and may result from a calculation error.
C: Choice C is incorrect and may result from a calculation error.
D: Choice D is incorrect and may result from a calculation error.

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