SOLUTION: If the slope of line f is 2, and a line d is perpendicular to the line f, what is the slope of line d?

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Question 777780: If the slope of line f is 2, and a line d is perpendicular to the line f, what is the slope of line d?
Answer by Alan3354(69443) About Me  (Show Source):
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If the slope of line f is 2, and a line d is perpendicular to the line f, what is the slope of line d?
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-1/2