Using the condition for a relation to be a function, we have that items 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.
In this problem, we have that:
- Item b is not a function, as the input 6 is associated with two outputs.
- Item c is not a function, because the graph has vertically aligned points, meaning that values of x are associated with multiple, in this case 2, values of y.
More can be learned about relations and functions at https://brainly.com/question/12463448
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