Question

Question
Which of these is NOT a function?



(1 point)
Responses

All of them
All of them

3 only
3 only

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

1 and 2 only
1 and 2 only

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

3 and 4 only
3 and 4 only
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Item
1
, Unattempted.
Item
2
, Unattempted.
Item
3
, Unattempted.
Item
4
, Unattempted.
Item
5
, Unattempted.


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Answer 1

I don’t see the four items (1–4) you’re supposed to choose from. Can you paste or describe them (equations, graphs, or mapping diagrams)? Then I’ll tell you which is NOT a function.

Meanwhile, here’s how to decide so you can check quickly:

- For a graph: use the vertical line test — if any vertical line intersects the graph more than once, it is NOT a function.
- For a mapping diagram: each input (domain element) must point to exactly one output. If any input points to two different outputs, it’s not a function.
- For equations: solve for y (if possible). If you get two or more y-values for some x (for example y^2 = x gives y = ±√x), it’s not a function of x unless you restrict the branch.
- For sets of ordered pairs: no two pairs can have the same first coordinate with different second coordinates.

If you paste the four items I’ll mark which one(s) are not functions and explain why.