SOLUTION: Which line is perpendicular to the line y =1/2 x + 9?

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Question 861095: Which line is perpendicular to the line y =1/2 x + 9?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 
Hi,
One with m = -2
y = green%28-2%29x+%2B+c