It is the difference in the abscissae of the points divided by the difference in their ordinates, provided the latter is not zero. Otherwise, the slope is infinite.
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Where are the points!
Another set of points are needed to find the slope.
The slope is 0.
The line is vertical on the graph. Its slope is infinite.
If you mean points of (6, 9) and (7, 1) then the slope of the line is -8