Question 431042
  <pre><font face = "Tohoma" size = 4 color = "indigo"><b> 
Hi
Line passing thru point(3,9) perpendicular to x = 3 (Blue) 
 y = 9 (green line)
{{{drawing(300,300,   -10,10,-10,10,  blue(line(2,10,2,-10)) grid(1),
circle(2, 9,0.4),
graph( 300, 300, -10,10,-10,10,0,9))}}}