To be a relation to a function there must be single output for single input thus tables (1) and (3) represent the function.
What is a function?
A certain kind of relationship called a function binds inputs to essentially one output.
A function can be regarded as a computer, which is helpful.
The machine will only accept specified inputs, described as the function's domain, and will potentially produce one output for each input.
In a function for every single input (x), there must be one output(y).
In the given second table,
For x = 0 → y =2 and y = 1 thus it will not be a function.
In the fourth table,
For x = 2 → y =2 and y = 6 thus it will not be a function.
Hence "To be a relation to a function there must be single output for single input thus tables (1) and (3) represent the function".
For more about the function,
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