Question 629152
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
points  {{{m =(y[2] - y[1])/(x[2] - x[1])}}} 
(5, 3)
(1,-1)    m = 4/4 = 1,   y = x-2  the Eq of the line thru these 2 points
<u>Fold line</u> so that the point (5, 3) lands on top of the point (1,-1)
Line Perpendicular, passing thru the midpoint( {{{(x[1] + x[2])/2}}}, {{{(y[1] + y[2])/2  )}}})(3,1)
which is {{{y = -x + 4}}}
{{{drawing(300,300,   -6, 6, -6, 6,   grid(1),
circle(5, 3,0.3),
circle(1, -1,0.3),
graph( 300, 300, -6, 6, -6, 6,0,-x+4,x-2))}}}