Functions
A function is a type of relation where each input has only one output
example
X Y
3 6
4 8
2 9
This is a function because every input has only one output
X Y
2 7
4 9
3 5
2 2
This is not a function because the input 2 has the output of 2 and 7
Another way of finding functions is the vertical line test if there is more than one point on the line it is not a function.
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