Using the function concept, we have that:
- Items, a, and d are functions.
- Item b and c are not functions.
When does a relation represents a function?
A relation represents a function when each value of the input is mapped to only one value of the output.
On a graph, it means that each value of x is mapped to only one value of y, that is, there are no vertically aligned points on the graph.
For this problem, relation c does not represent a function, as there are multiple values of x are related to two values of y, and there are vertically aligned points on the graph.
In item b, when x = 6, there are two values of y, hence this is also not a function. For items a and d, each value of x is mapped to only one value of y, hence they are functions.
More can be learned about relations and functions at https://brainly.com/question/12463448
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