10

Set 6: Linear Inequalities (Advanced)

Explanation

Answer: A

Solve: 2x5>3x|2x - 5| > 3x

A.

x<1x < 1

✓ Correct
B.

x<5x < -5

C.

x>1x > 1

D.

x<1x < 1 or x>5x > 5

Detailed Explanation

Choice A is correct. Choice A is the correct answer. Split into cases. 1. Case 1: 2x5>3x5>xx<52x - 5 > 3 x \rightarrow -5 > x \rightarrow x < -5 2. Case 2: 2x5<3x5x<5x<12x - 5 < -3 x \rightarrow 5 x < 5 \rightarrow x < 1 3. Combine: The union of x<5x < -5 and x<1x < 1 is x<1x < 1 (since x<5x<-5 is inside x<1x<1). - Check x=0x=0: 5>0|-5| > 0 (5>0) True. - Check x=6x=-6: 17>18|-17| > -18 (17>-18) True. - Check x=2x=2: 1>6|-1| > 6 (1>6) False. A>B|A| > B is A>BA > B or A<BA < -B. 1. 2x5>3xx>5x<52x - 5 > 3 x \rightarrow -x > 5 \rightarrow x < -5 2. 2x5<3x5x<5x<12x - 5 < -3 x \rightarrow 5 x < 5 \rightarrow x < 1 Union: x<1x < 1 OR x<5x < -5. The set x<1x < 1 includes x<5x < -5. So x<1x < 1. So x<1x < 1 seems correct. Choice A is correct. Choice B is incorrect (subset). Choice C is incorrect. Choice D is incorrect.

Key Steps:

The correct answer is x<1x < 1

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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