3

Set 6: Linear Inequalities

Explanation

Answer: A

Solve: 3x+7>2x+5-3x + 7 > -2x + 5

A.

x<2x < 2

✓ Correct
B.

x>2x > 2

C.

x<2x < -2

D.

x>2x > -2

Detailed Explanation

Choice A is correct. Choice A is the correct answer. Collect variables on one side. 1. Add 3 x: 7>x+57> x + 5 2. Subtract 5: 2>x2> x, or x<2x < 2 Alternatively: 1. Add 2 x: x+7>5-x + 7 > 5 2. Subtract 7: x>2-x > -2 3. Divide by -1: x<2x < 2 (reverse sign) Strategic Tip: Both methods work. Adding 3x3x avoids dividing by a negative. Choice B is incorrect because it reverses the inequality direction. Choice C is incorrect because it uses negative 2. Choice D is incorrect because it uses negative 2 and wrong direction.

Key Steps:

The correct answer is x<2x < 2

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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