Set 3: Linear Functions

Explanation

Answer: A

Find the slope of a line perpendicular to the line connecting $(1, 1)$ and $(4, 1)$ .

Undefined

✓ Correct

$0$

$1$

$-1$

Detailed Explanation

Choice A is correct. Choice A is the correct answer. Horizontal vs Vertical. 1. Original Line: Points have same y ( $1$ ). It's horizontal ( $m=0$ ). 2. Perpendicular: Perpendicular to horizontal is vertical. 3. Slope: Vertical lines have undefined slope. Strategic Tip: The negative reciprocal of 0 is $-1/0$ , which is undefined. Choice B is incorrect because parallel. Choice C is incorrect. Choice D is incorrect.

Key Steps:

•

The correct answer is Undefined

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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