Question 220591: When calculating the slope of the line through two points, does the order of subtracting the coordinates matter? Explain with examples.
Answer by likaaka(51)   (Show Source):
You can put this solution on YOUR website! No it does not. Just take any two coordinates and try them both ways, the slope will be the same always.
For example (5, -1) and (3, 6)
m=(y - ysub1)/(x - xsub1)
(-1-6)/(5-3)=(-7)/2 or -(7/2)
(6-(-1))/(3-5)=7/(-2) or -(7/2)
Here it doesn't matter where the negative is, either in the numerator or the denominator, because both ways its show a negative slope
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