4

Set 11: Linear Inequalities (Intermediate)

Explanation

Answer: A

Solve: 5(x2)3(x+4)5(x - 2) \geq 3(x + 4)

A.

x11x \geq 11

✓ Correct
B.

x11x \leq 11

C.

x1x \geq 1

D.

x1x \leq 1

Detailed Explanation

Choice A is correct. Choice A is the correct answer. Distribution and combining like terms are essential for multi-step inequalities. 1. Distribute: 5x103x+125x - 10 \geq 3 x + 12 2. Subtract 3 x: 5x3x103x3x+125x - 3 x - 10 \geq 3 x - 3 x + 12, giving 2x10122x - 10 \geq 12 3. Add 10: 2x222x \geq 22 4. Divide by 2: x11x \geq 11 Strategic Tip: Always distribute first before combining like terms in inequalities with parentheses. Choice B is incorrect because it reverses the inequality without justification. Choice C is incorrect because it might result from errors in combining constants or coefficients. Choice D is incorrect because it combines both wrong value and wrong direction.

Key Steps:

The correct answer is x11x \geq 11

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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