Question 171407
What is the slope of a line (a) paraell, and (b) perpendicular to the line through points (5,7) and (0,3)?
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The slope, m, of the line thru the points is (diff in y)/(diff in x)
m = (7-3)/(5-0) = 4/5
All lines parallel has the same slope, 4/5.
All lines perpendicular have a slope that the negative inverse, -5/4.