Question 7 Answer & Explanation - SAT Algebra

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algebra

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

Undefined

$0$

$1$

$-1$

Correct Answer: A

Choice A is the correct answer. Horizontal vs Vertical.

Original Line: Points have same y ( $1$ ). It's horizontal ( $m=0$ ).
Perpendicular: Perpendicular to horizontal is vertical.
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.

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