Question

Pleaseeeeeeeeee helppppppppp meeeeeeeeeee

Answer 1

Answers:

1. Function
2. Not a function
3. Function
4. Not a function

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Explanation:

If x repeats itself, then we don't have a function. For instance, relation 2 has the x value -4 show up twice. That input leads to multiple outputs which is why we don't have a function. Relation 4 is a similar story (this time the input 'u' shows up twice).

Relations 1 and 3 don't have this issue, so they are functions.