Question 96941
for 2 points with co-ordinates as (x1,y1) and (x2,y2)
the slope is given by y2 - y1 / x2 -x1
Hence the slope of the line with the given points (6,3) and (7,7) is 
7-3 / 7-6  = 4

Let the slope of the line perpendicular to it be m

Now since the product of the slope of a line and the slope of its perpendicular is -1 
=> m* 4 =-1
Hence, m = -1/4