8

Set 12: Linear Inequalities

Explanation

Answer: B

If 4x+854\frac{4x + 8}{5} \leq 4, what is the greatest integer value of xx?

A.

22

B.

33

✓ Correct
C.

44

D.

55

Detailed Explanation

Choice B is correct. Choice B is the correct answer. Finding maximum integer values requires solving and identifying boundaries. 1. Multiply by 5: 54x+85545\cdot \frac{4 x+8}{5} \leq 5 \cdot 4, giving 4x+8204x + 8 \leq 20 2. Subtract 8: 4x124x \leq 12 3. Divide by 4: x3x \leq 3 4. Greatest integer: Since x3x \leq 3, maximum is exactly 3 Strategic Tip: For \leq inequalities, the boundary value itself is included in the solution set. Choice A is incorrect because while x=2x = 2 satisfies the inequality, it's not the GREATEST integer. Choice C is incorrect because x=4x = 4 does not satisfy x3x \leq 3 (4 is greater than 3). Choice D is incorrect because x=5x = 5 exceeds the solution range.

Key Steps:

The correct answer is 33

Why others are wrong:
A: Choice A 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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