Respuesta :

AmyTin
It should be the 3rd one
A function can only have ONE answer
E.g. y = a (correct)
y = +/-a (incorrect)
mreijepatmat
It's the ellipse (3rd one). Why it's not a function?

If you draw a vertical line and if this line intercepts the figure in more than one point, then this figure doesn't represent a function (but a relation instead)

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