how find the relation function between the last three graph ?

if function of graph one G1
fun of graph two g2
fun of graph three g3 
fun of graph four g4

at left side please help what is the relation function between g2,g3,g4 (must equal G1)

[Image Analyst]

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

Diagrams, like screenshots of the graphs, would help.