Question 448077
y = -2 

slope of this line is zero, it is parallel to x-axis. 
It will satisfy all points (x,-2) i.e any value for x.




slope of second line = -6+8/-9+9 = 2/0 

so, undefined.

this line is parallel to y-axis and it is a vertical line. It will satisfy all points (-9,y) i.e any value for y.