PSAT Math Multiple-Choice Practice Question 719
Question: 719
If the slope of line A is 
, where x and y are positive numbers, what is the slope of a line that is perpendicular to A ?
Correct Answer: D
Explanation:
(D) A line perpendicular to line A has a slope that is the negative reciprocal of 
.
The negative reciprocal is 
, or 
.
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