Question

Is the following relation a function?
give me one sec while i draw it out

Answer 1

woops why is supposed to be above the other circle

Answer 2

y*

Answer 3

either way its not a function
each input value can map to AT MOST 1 output value

Answer 4

it is not a function because one of the x's has more than one y
0 can be either 1 or 3
for it to be a function, each x can only have 1 y