SOLUTION: A line contains the points (a-4,b+4) and (a,b) What is the slope of the line?

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Question 142133: A line contains the points (a-4,b+4) and (a,b) What is the slope of the line?
Answer by nabla(475) About Me  (Show Source):
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m=(y2-y1)/(x2-x1)=(b-(b+4))/(a-(a-4))=-4/4=-1