7

Set 8: Linear Inequalities (Advanced)

Explanation

Answer: A

Solve: 2x34x+131\frac{2x - 3}{4} - \frac{x + 1}{3} \geq 1

A.

x12.5x \geq 12.5

✓ Correct
B.

x12.5x \leq 12.5

C.

x10x \geq 10

D.

x1x \geq 1

Detailed Explanation

Choice A is correct. Choice A is the correct answer. Clear fractions with LCD = 12. 1. Multiply by 12: 3(2x3)4(x+1)12(1)3(2 x - 3) - 4(x + 1) \geq 12(1) 2. Distribute: 6x94x4126x - 9 - 4 x - 4 \geq 12 3. Combine: 2x13122x - 13 \geq 12 4. Add 13: 2x252x \geq 25 5. Divide by 2: x12.5x \geq 12.5 Strategic Tip: Don't forget to distribute the negative sign to the second term: 4(1)=4-4(1) = -4. Choice B is incorrect because it reverses the inequality. Choice C is incorrect because it solves incorrectly. Choice D is incorrect because it solves incorrectly.

Key Steps:

The correct answer is x12.5x \geq 12.5

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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