calcius
posted by rachel on .
Determine whether the relation represents a function. If it is a function, state the domain and range.
{(2, 1), (1, 2), (0, 3), (1, 2), (3, 6)}
a. function
domain: {2, 1, 0, 1, 3}
range: {1, 2, 3, 6}
b. function
domain: {1, 2, 3, 6}
range: {2, 1, 0, 1, 3}
c. not a function
I think the answer is c. not a function can someone please help

If it only has one value of y for each value of x, it is a function.
That is the case here.
x has values 2 1 0 1 3
y has values 1 2 3 6
So a is correct.
It does not matter that y is 2 twice, because it is at different x values.
if y were 2 and +2 at the same x, then it would be a problem and it would not be a function.