Aset of ordered pairs (x, y) is called a it may or may not also be a function.

Relation

Step-by-step explanation:

Relation:it is defined as the mapping between the elements of two set A and B.

Or

It is defined as the mapping between x and y.

It is  represented by R

R={}

The relation may or may not be a function

It every x has one image then the relation is called function.

If any x have two or more than two images then the relation is not called a function.

A set of ordered pairs (x,y) is called  a relation .It may or may not also be a function.

just sum

10 + 10 = 20