Is there a picture? I would love nothing more than to help but there is no data provided :(
First, find the slope of the line contains the points (1,-6) and (-2,6) using slope formula
m =

plug in the numbers
m =

m =

m =

m = -4
Second, determine the slope of perpendicular line
The slope of the perpendicular line is the opposite and reciprocal from the other line. Thus, the slope is