-1.5
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further information is needed.
does the line pass through at x = -2.5? or y = -2.5
you also need to know another point to find an equation to the line.
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
Another coordinate is needed to work out the slope.
The line perpendicular to a line with a slope of 1/5 has a slope of -5.