Question 613699
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi, 
x=1/16 y^2 or 16x = y^2 || This is a parabola opening 'right' Axis of symmetry is y = 0
 4p = 16,  p = 4 , focal pt(4,0)  directrix is x = -4, 
{{{drawing(300,300, -10,10,-10,10,  blue(line(-4,10,-4,-10))  ,  grid(1),
circle(4, 0,0.3),
green(line(4,8,4,-8)),
graph( 300, 300, -10,10,-10,10,  0,4sqrt(x), -4sqrt(x)))}}}