SOLUTION: What is the slope of a line perpendicular to a line with slope -1 ?

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Question 1148022: What is the slope of a line perpendicular to a line with slope -1 ?
Answer by Alan3354(69443) About Me  (Show Source):
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What is the slope of a line perpendicular to a line with slope -1 ?
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m2 = -1/m1 = -1/-1 = +1
It's +1