Arthur D. answered 12/15/14
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first find the line that goes through (-7,0) and (0,13)
y=mx+b
m=(13-0)/[0-(-7)]
m=13/7
y=(13/7)x+b
use either point to find b
13=(13/7)(0)+b
13=0+b
b=13
the line is y=(13/7)x+13
a line perpendicular to this line will have a slope that is the negative reciprocal of 13/7
one such line is y=(-7/13)x+13