No slope is undefined i.e. a vertical line
slope of 0 is a horizontal line...
i believe...
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To calculate the slope of a line that goes between two points, you need to divide the difference in y-coordinates, by the difference in x-coordinates. In this case, hte calculation would be: (2 - (-4)) / (3 - 0)
If the points are (0, 0) and (2, 4) then the slope works out as 2
Slope = [Difference in second coordinates of each pair]/[Difference in first coordinates of each pair] = [7 - 0]/[6 - 0] = 7/6 or 1.166...
If you mean points of (0, -3) and (-6, 7) then the slope is -5/3
zero is horizontal, undefined is vertical