A. find a slope-intercept equation for line a. b. find a point-slope for line b.

The slope intercept form of the line is given by:
 
 The point-slope form is given by:
 
 Where,
 m: slope of the line
 b: cutting point with the y axis
 (xo, yo): ordered pair that belongs to the line

  For line A:
 The slope is 
 
 
 The cut point with the y axis is:
 
 Substituting values we have:
 

  For line B:
  The slope is given by:
  
  
  
  
  Then, the equation of the line is:
  

  
  Option A