Question

Which of these is NOT a function?



(1 point)
Responses

2,3, and 4 only
2,3, and 4 only

All of them
All of them

3 only
3 only

1,3, and 4 only
1,3, and 4 only

3 and 4 only
3 and 4 only

1 and 2 only

Answer 1

I don't have the list or images of items 1–4, so I can't pick which are not functions. Please paste the four relations/graphs/diagrams (or describe them).

If it helps, here are quick tests you can use:
- For a set of ordered pairs: check whether any first coordinate appears more than once with different second coordinates. If so, it's not a function.
- For a graph: use the vertical line test — if any vertical line hits the graph more than once, it's not a function.
- For a mapping diagram: each input must have exactly one arrow leaving it.
- For an algebraic rule: ensure the rule gives exactly one output for each input in the domain (e.g., y = ±√x is not a function unless you choose one sign).

Send the four items and I'll identify which are not functions.