@jamierox4ev3r
Question 19 (Multiple Choice Worth 1 points)

(03.01 LC)

The domain of the following relation: R: {(3, 5), (8, 6), (2, 1), (8, 6)} is

No domain exists
{1, 5, 6}
{3, 8, 2, 8}
{2, 3, 8}

Question

@jamierox4ev3r 
Question 19 (Multiple Choice Worth 1 points)

(03.01 LC)

The domain of the following relation: R: {(3, 5), (8, 6), (2, 1), (8, 6)} is

 No domain exists
 {1, 5, 6}
 {3, 8, 2, 8}
 {2, 3, 8}

mathmale · Answer

You are given a relation (above), represented by four pairs of x- and y-coordinates.

In such a situation, you have a function IF AND ONLY IF for each x value there is one and only one corresponding y value. 

So, what do you think?  Is the given relationship a function or not?

mrs.ambrose614 · Answer

Would then wiser be c???

triciaal · Answer

Domain set of x-values only need to list once (8, 6) is a duplicate entry  I  would choose D

mathmale · Answer

I agree with triciaal.  (8,6) shows up twice.  Ordinarily I'd cry foul!  But here the same y-value (6) is associated with the x-value 8, so this relationship appears to be one to one, and thus is a function.