The following figure shows the entire graph of a relationship.
Does the graph represent a function?
Yes or no

Yes, the given graph is representing the function.
A function is defined as the expression that set up the relationship between the dependent variable and independent variable.
A function in mathematics from a set X to a set Y allocates exactly one element of Y to each element of X. The sets X and Y are collectively referred to as the function's domain and codomain, respectively.
It is observed from the graph that at every point of y there is a value of x. Then the graph is a function.
Therefore, Yes, the given graph is representing the function.
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