Question 633409
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Hi,
Using the standard slope-intercept form for an equation of a line y = mx + b
  where m is the slope and b the y-intercept.
{{{m =(y[2] - y[1])/(x[2] - x[1])}}}
L1:  (-6, -3), 
     (-10, 0)   m = -3/4,   y = (-3/4)x - 30/4
L2:  (3, 9), 
      (0, 5)    m = 4/3,     y = (3/4)x  + 5
Lines Perpendicular