4

Set 10: Linear Inequalities (Intermediate)

Explanation

Answer: A

Solve: 2x+512x + 5 \geq 1 and 3x>12-3x > -12

A.

2x<4-2 \leq x < 4

✓ Correct
B.

2x<6-2 \leq x < 6

C.

x2x \geq -2

D.

x<4x < 4

Detailed Explanation

Choice A is correct. Choice A is the correct answer. Solve independently and find the intersection. 1. First: 2x4x22x \geq -4 \rightarrow x \geq -2 2. Second: 3x>12x<4-3 x > -12 \rightarrow x < 4 (Reverse sign!) 3. Combine: x2x \geq -2 AND x<42x<4x < 4 \rightarrow -2 \leq x < 4 Strategic Tip: Don't forget to reverse the sign when dividing by -3. Choice B is incorrect because it might result from dividing 12 by 2 instead of 3. Choice C is incorrect because it ignores the second constraint. Choice D is incorrect because it ignores the first constraint.

Key Steps:

The correct answer is 2x<4-2 \leq x < 4

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.

🎯 Keep Practicing!

Master all sections for your best SAT score