Using the concept for a relation to represent a function, it is found that graphs 2, 3, 4 and 5 are functions.
When does a relation represents a function?
A relation represents a function when it value of the input is associated to only one value of the output.
On a graph, it means that each value of x has only one equivalent value of y, that is, there are no vertically aligned points.
In this problem, we have that:
- The first graph, which maps the circle is not a function, as there are multiple values of x associated with two values of y, hence generating vertically aligned points.
- The last graph, below the constant line, also has values of x such as x = 0 mapped to two values of y(y = 1 and y = -2 for x = 0), hence it also is not a function.
All the other graphs are functions.
More can be learned about relations and functions at https://brainly.com/question/12463448
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