4

Set 7: Linear Inequalities

Explanation

Answer: A

If 4x+517-4x + 5 \leq 17, which number line best represents the solution?

A.

Closed circle at -3, arrow pointing right

✓ Correct
B.

Closed circle at -3, arrow pointing left

C.

Closed circle at 3, arrow pointing right

D.

Closed circle at 3, arrow pointing left

Detailed Explanation

Choice A is correct. Choice A is the correct answer. Graphing requires solving first, then correctly placing the circle and arrow. 1. Subtract 5: 4x12-4 x \leq 12 2. Divide by -4: x3x \geq -3 (REVERSE the sign!) 3. Graph: Closed circle at -3 (includes -3), arrow right (greater than) Strategic Tip: After dividing by a negative, double-check that you reversed the inequality before graphing. Choice B is incorrect because while the closed circle at -3 is correct, the arrow points left (representing x3x \leq -3), wrong direction. Choice C is incorrect because the boundary should be -3, not positive 3. Choice D is incorrect because it has both the wrong sign on the boundary and the wrong arrow direction.

Key Steps:

The correct answer is Closed circle at -3, arrow pointing right

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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