As given by the question
There are given that the graph of any function
Now,
To check, whether the given graph is a function or not, use the vertical line test.
Then,
According to vertical line test;
vertical line test is used to define the given curve is function or not.
so,
From graph 1:
Graph 1 represents the function.
From graph 2:
Graph second is not a function
From graph 3:
Graph 3 represents the function.
From graph 4:
Graph 4 also represents the function
Now,
From graph 5:
Graph 5 is not a function.
And,
Graph 6 is not a function.