Question 494456
find a slope of the line through the pair of points 
(-1/3,0) and (-1/2,-1/2)
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slope, m = diffy/diffx
m = (0 + 1/2)/(-1/3 + 1/2)
m = (1/2)/(1/6)
m = 3
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I would call it "the slope", not "a slope."