Find the slope of the line that contains (4, -6) and (4, 4). A. -2
B. 0
C. undefined
D. 5/4

C. undefined

Explanation:

 The coordinates of the line is given as:

                  (4, -6) and (4, 4).

x1   =  4

y1  = -6

x2  = 4

y2  = 4

  Slope  =    

  Now insert the parameters and solve;

  Slope  =  = undefined

The slope of the line is undefined

because the center-south is called the heart of the country