(5, -4) and (0, -3)
Slope = ( y2-y1 ) / ( x2-x1 )
= (-3 + 4) / (0 - 5) = (1) / (-5)
= -0.2
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The slope is -9.
If you mean points of (-2, -1) and (3, 5) then the slope is 6/5
If you mean points of (055, 18) and (566, 81) then the slope works out as 9/73
84
The slope of the perpendicular to the line passing through P1(3,6) and P2(5,1) is 2/5. Note: the slope of the original line is (change in y)/(change in x), yielding -5/2. The slope of the perpendicular is the negative reciprocal, 2/5