What is the slope of a line parallel to a vertical line?

 
 
How do you find the x-intercept and y-intercept, of this line?
8x - 2y = 32
 
 
How do you find the slope and y-intercept out of this equaiton?
5x + 3y = 9
 
 
What is the slope intercept form of x - 3y = 6 
 
 
What is the slope of the line that passes through the points (2, -1) and (2,0)?