3

Set 8: Linear Inequalities (Intermediate)

Explanation

Answer: A

Solve: 2(3x4)5x+22(3x - 4) \geq 5x + 2

A.

x10x \geq 10

✓ Correct
B.

x10x \leq 10

C.

x10x \geq -10

D.

x10x \leq -10

Detailed Explanation

Choice A is correct. Choice A is the correct answer. Distribution and multi-step solving are combined in this problem. 1. Distribute: 2(3x)2(4)5x+22(3 x) - 2(4) \geq 5 x + 2, giving 6x85x+26x - 8 \geq 5 x + 2 2. Subtract 5 x: 6x5x85x5x+26x - 5 x - 8 \geq 5 x - 5 x + 2, giving x82x - 8 \geq 2 3. Add 8: x10x \geq 10 Strategic Tip: When distributing with parentheses, multiply the coefficient by EVERY term inside. Choice B is incorrect because it reverses the inequality without justification. Choice C is incorrect because it uses -10 instead of 10, possibly from a sign error. Choice D is incorrect because it combines both wrong sign and wrong direction.

Key Steps:

The correct answer is x10x \geq 10

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