SOLUTION: A line passing through (–9, –4) and (10, y) is perpendicular to a line with slope -. Find the value of y.

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Question 770946: A line passing through (–9, –4) and (10, y) is perpendicular to a line with slope -. Find the value of y.
Answer by Alan3354(69443) About Me  (Show Source):
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A line passing through (–9, –4) and (10, y) is perpendicular to a line with slope -. Find the value of y.
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Slope of what?