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ASAP!!!! FUNCTIONS HELP

ASAP!!!! FUNCTIONS HELP-example-1
User WoLfPwNeR
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Answer:

3

Explanation:

All but first for every single x gives single y so the second, third and fourth are function

At first for x=2 we have two y (2 or -2) so this isn't function.

User Bartosz Kowalczyk
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