SOLUTION: 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. Pr

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
I choosen Not a function is that correct?
Please show me the correct way if I am wrong I appreciate it...Not very good in algebra...Help
Answer by nycsub_teacher(90) (Show Source): You can put this solution on YOUR website!
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
=======================================================
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?

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