5

Set 8: Linear Inequalities

Explanation

Answer: B

Which inequality has NO solution?

A.

x+5>x+3x + 5 > x + 3

B.

2x+1<2x42x + 1 < 2x - 4

✓ Correct
C.

3x3x3x \geq 3x

D.

x2x+1x - 2 \leq x + 1

Detailed Explanation

Choice B is correct. Choice B is the correct answer. Some inequalities lead to contradictions when simplified. 1. Simplify: Subtract 2x2x from both sides: 2x2x+1<2x2x42x - 2 x + 1 < 2 x - 2 x - 4 2. Result: 1<41< -4 3. Contradiction: This is FALSE, so no value of xx satisfies this inequality Strategic Tip: When variables cancel and you're left with a false statement (like 1<41< -4), the inequality has no solution. Choice A is incorrect because subtracting xx gives 5>35> 3, which is ALWAYS true (all real numbers are solutions). Choice C is incorrect because this simplifies to 000\geq 0, which is true, so all real numbers work. Choice D is incorrect because subtracting xx gives 21-2 \leq 1, always true.

Key Steps:

The correct answer is 2x+1<2x42x + 1 < 2x - 4

Why others are wrong:
A: Choice A 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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