Answer:
The value of k is -2
Step-by-step explanation:
The cut point with the y axis for both graphs occurs when x = 0
 We have then:
 For f (x):
 The cut point with the y axis is:
 For g (x):
 The cut point with the y axis is:
 Therefore, the value of k is given by the vertical displacement of the graph  k units.
 We have then:
 From here, let's clear k:
I am not sure if this helped. But, I hope it did. I ma sorry if you get it wrong.