Respuesta :
This relationship is not a function because -7 has 2 outputs(2 and 15).
In a function, each input has to have exactly one output.
In a function, each input has to have exactly one output.
This is not a function because functions cant have 2 point that share an x value(having two outputs) . -7 is used twice.
I believe this is called the vertical line theory
I believe this is called the vertical line theory