The community puzzle thread

[Legend]

I'm sure you guys will find this one easy.  I'll come up with a better one next time.  

3,4,6,1
12,3,2,1
2,2,1,Y
1,3,X,4

What is x and y?  

And for the hint that probably makes it too easy.  

Spoiler for hint:

<br>One of the the four: +,-,*,/<br>

Is there any relationship between each line, or are they just examples to get the point across?