Question

formalizing relations and functions.

Answer 1

The domain of a relation is all the x values that function can take.
So if we have the relation {(3,4),(3,5),(6,7),(8,1)}
Then the x's are 3,6,8 so this is our domain {3,6,8}
The range of a relation is all the y values that function can be.
Then the y's are 4,5,7,1 so this is our range {1,4,5,7}
Now this relation I have here {(3,4),(3,5),(6,7),(8,1)} is not a function since there are two points that have an x equal but the y's are different.
It is not a function if there are more than one points in the set that have the same x but different y.

Answer 2

So looking at the fist one you want to give it show of listing the elements of the domain for your problem?

Answer 3

shot*

Answer 4

(x,y)
the x is the first number in the pair
the y is the second number in the pair
just list me all the x values that this relation takes