Question 10 Answer & Explanation - SAT Algebra

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algebra

If line $L$ has slope $m$ ( $m eq 0$ ), what is the slope of a line perpendicular to $L$ ?

$-\frac{1}{m}$

$\frac{1}{m}$

$-m$

$m$

Correct Answer: A

Choice A is the correct answer. Definition of perpendicular slope.

Definition: Negative reciprocal.
Result: $-1/m$ .

💡 Strategic Tip: Flip the fraction and flip the sign.

Choice B is incorrect because reciprocal only. Choice C is incorrect because negative only. Choice D is incorrect because parallel.

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