(SELECT ALL) Which set(s) of ordered pairs does not represent a function?

To determine which sets of ordered pairs do not represent a function, we need to check if any input (the first element of the ordered pair) is associated with more than one output (the second element). If an input has multiple outputs, then it does not represent a function.

Let's examine each set of ordered pairs:

1. **{(−8,3),(−4,2),(2,−8),(−4,9)}**
- Input -4 is associated with two outputs: 2 and 9.
- This set does **not** represent a function.

2. **{(2,1),(9,1),(−6,−1),(−2,9)}**
- Each input is unique:
- 2 → 1
- 9 → 1
- -6 → -1
- -2 → 9
- This set **does** represent a function.

3. **{(0,−4),(-2,−2),(7,−4),(−2,2)}**
- Input -2 is associated with two outputs: -2 and 2.
- This set does **not** represent a function.

4. **{(−7,−8),(−1,6),(−4,−4),(−7,−2)}**
- Input -7 is associated with two outputs: -8 and -2.
- This set does **not** represent a function.

So, the sets of ordered pairs that do not represent a function are:
- **{(−8,3),(−4,2),(2,−8),(−4,9)}**
- **{(0,−4),(-2,−2),(7,−4),(−2,2)}**
- **{(−7,−8),(−1,6),(−4,−4),(−7,−2)}**