math
posted by rmz .
What happens to the value obtained for the slope if the coordinates of the two ordered pairs aren't subtracted in the same order? what is an example.
All I know is that you would get the wrong slope for the ordered pairs, I do not know why. Can anyone help?

Correct slope = m = (y2y1)/(x2x1) = (y1y2)/(x1x2)
for a line between (x1,y1) and (x2,y2)
If the y2y1 in the numerator is not consistent with the x2x1 in the denominator, you get the wrong sign for the slope. For example,
(y2y1)/(x1x2) = m 
thanks now I know exactly what the situation is.