Answer:
(a) 

(b) 

(c) Answer of part a is equation of line 
 which is parallel to y axis and in part by equation of line is
 which is parallel to y axis and in part by equation of line is 
 which is parallel to x axis
 which is parallel to x axis 
Explanation:
We have given points are 

(a) Equation of line is given x = -9
We have to find the equation of line parallel to x= -9 and passing through 

x = -9 line is parallel to y axis and so slope will be infinite 
Equation of line is given by 

So 


(b) Equation of line is given 

This line is parallel to x axis so slope will be zero 
So equation of line will be 


(c) Answer of part a is equation of line 
 which is parallel to y axis and in part by equation of line is
 which is parallel to y axis and in part by equation of line is 
 which is parallel to x axis
 which is parallel to x axis