Answer:
The first one is the corresponding No. 1, The second one is No.3, The third one is No.4, and the fourth one is No.2
Explanation:
I did this on paper, everything checks out for the first and third line graph, and since the fourth one is a less than and not a less than/equal to, it is by default No.2. Finally, since there is only one left, process of elimination tells us that the second one is No.3