Perpendicular lines have negative reciprocal slopes.
The slope of the equation you are trying to find is 1/4.
Now, y = .25x + b (.25 = 1/4)
Plug in the point (-4, -13)
-13 = .25 (-4) +b
-13 = -1 + b
-12 = b
y = .25x + (-12)
Your equation is: y = .25x - 12
