Equivalence relations-Discrete Math Here is an equivalence relation R={ (x,y) | x-y is an integer} 
My question is: what is the equivalence class of 1 for this equivalence relation? 
Can say indicate the equivalence class of 1 as [(1)] = { (x,y), x-y=  }  
I am confused about how to write the right hand side? can someone help me? 

It seems like your equivalence relation is that $x$ is related to $y$ if $x-y \in \mathbb Z$. What numbers give integers if you subtract $1$ from them? The integers, since they are closed under subtraction.
