Question 174671
I need help on this one and It is not listedhere and I looked...Help

Determine whether the relation represents a function. If it is a function, state the domain and range.

Problem:  {(-2,-1),(-1,-4),(0,-5),(1,-4),(3,4)}

the answers llisted on my sheet is 

A. Function, domaion is:{-1,-4,-5,4} and Range is {-2,-1,0,1,3}
B. Function, Domain is ;{-2,-1,0,1,3} Range {-1,-4,-5,4}
C. Not a Function

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Look at a point more closely.

Here is the general point: (x,y)

x = domain

y = range

If any of the x points repeat, then there is no function.

Here is your function:

{(-2,-1),(-1,-4),(0,-5),(1,-4),(3,4)}

Look at the x points and they are:

-2, -1, 0, 1 and 3

Do any of the integers repeat?

No, right?

So, this is a funtion.

The answer is (b).  

NOTE: Notice that the range has two -4.  You only need to list one of them for the range when numbers repeat.  It does not matter if the y values repeat.
The x values cannot repeat because it would take x to two different destinations.

Understand?