4

Set 7: Linear Inequalities (Advanced)

Explanation

Answer: A

If 3(x1)+x2(2x+1)3(x - 1) + x \geq 2(2x + 1), what is the solution?

A.

No solution

✓ Correct
B.

All real numbers

C.

x5x \geq 5

D.

x5x \leq 5

Detailed Explanation

Choice A is correct. Choice A is the correct answer. Sometimes variables cancel out, leaving a false statement. 1. Distribute: 3x3+x4x+23x - 3 + x \geq 4 x + 2 2. Combine like terms: 4x34x+24x - 3 \geq 4 x + 2 3. Subtract 4 x: 32-3 \geq 2 4. Interpret: This statement is FALSE. -3 is never greater than or equal to 2. 5. Conclusion: There is no value of xx that makes this true. Strategic Tip: If variables cancel and the remaining statement is false (e.g., 32-3 \geq 2), there is NO solution. If true (e.g., 525\geq 2), the solution is All Real Numbers. Choice B is incorrect because the resulting statement 32-3 \geq 2 is false. Choice C is incorrect because it assumes variables don't cancel. Choice D is incorrect because it assumes variables don't cancel.

Key Steps:

The correct answer is No solution

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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