Final answer:
To classify the given relation as a function, one of the ordered pairs with the x-value of 3 should be removed.
Step-by-step explanation:
In order for a relation to be classified as a function, each input value (x) must have exactly one corresponding output value (y). If there are any duplicate x-values in the relation, then it is not a function.
In the given relation { (1,12), (3,8), (3,11), (6,9), (7,11) }, we can see that the x-value 3 is repeated twice. Therefore, to classify this relation as a function, we need to remove one of the ordered pairs with an x-value of 3.
If we remove the ordered pair (3,8) or the ordered pair (3,11), then the relation will be classified as a function since each x-value will have only one corresponding y-value.