Question 848502
Have one ellipse on one side, label it x, have another and label it f(x)


in x   {-1,2,3}

in f(x){4,5}

draw a line from -1 to 4

draw a line from 2 to 5

draw a line from 3 to 5

Is it a function?  Yes.

It isn't one-to-one, due to more than one x value producing the same y-value. 

It is a function. If it wasn't we'd have where more the same x value is producing multiple y-values.