For each relation decide whether or not it is a function Sol

For each relation, decide whether or not it is a function.

A function is a relation (so, it is the set of ordered pairs) that does not contain two pairs with the same

first component.

So, Realtion 1 is not a function as ( 6 , -9) and ( 6 ,1 ) have same first components

Relation 2 is not a function as ( moon , 9) and ( moon ,6 ) have same first components