Answer:
The greatest y-intercept c = 6
Explanation:
we know that 
 slope-intercept form y = mx +c
a) Given that f(x) = 

 

 comparing y = mx +c
 slope of the line m = 6 and Y - intercept c= 1/6 
b) Given that f(x) = 

 y = 6x -6
 comparing y = mx +c
 slope of the line m = 6 and Y - intercept c= -6
c) 
 Given that f(x) = 
 
 
 y = 
 
 
 comparing y = mx +c
 slope of the line m = 
 and Y - intercept c= 6 ( greatest intercept)
 and Y - intercept c= 6 ( greatest intercept)
d) 
 Given that 6 k(x) = x
 k(x) = 

 y = 

 comparing y = m x +c
 The slope of the line m =
 and Y-intercept c=0
 and Y-intercept c=0
Final answer:-
The greatest y-intercept c = 6