Question 469902
  <pre><font face = "Tohoma" size = 4 color = "indigo"><b> 
Hi
A line that passes thru the points (5,0) and (5,2) has an undefined slope:  True
Using the point-slope formula, {{{m =(y[2] - y[1])/(x[2] - x[1])}}}
(5,0) and 
(5,2)  m = -2/0  CANNOT  divide by zero.  slope is undefined. 
 x = 5 the  EQ of this line
{{{drawing(300,300,   -6, 6, -6, 6,  blue(line(5,6,5,-6))  , grid(1),
circle(5, 0,0.3),
circle(5, 2,0.3),
graph( 300, 300, -6, 6, -6, 6))}}}