Another coordinate is needed to work out the slope.
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The slope is 5.
If you mean points of (6, 9) and (7, 1) then the slope of the line is -8
Coordinates: (-4, 1) and (6, 3)Slope of line: 1/5
The line perpendicular to a line with a slope of 1/5 has a slope of -5.
If you mean points of (6, 9) and (7, 1) then the slope of the line is -8