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Mathematics 18 Online
eduD:

http://prntscr.com/i1axii

Vocaloid:

easy check - if all the x-values are unique its a function, if not then it's not a function

eduD:

what does unique mean in this question

Vocaloid:

all different from each other

eduD:

so yes,no,yes,no

Vocaloid:

well done

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