Answer:
No, Yes, No, Yes
Step-by-step explanation:
A function is where each input (the first value in the ordered pair) only has one output (the second value in the ordered pair)
1.
List of inputs: 1, 2, 2, 7
List of outputs: 3, 5, 7, 9
For the input value of 2, there is more than one output. 2 is mapped to both 5 and 7, so this is not a function
2.
Inputs: 1, 2, 3, 4
Outputs: 3, 5, 7, 9
Each input only has one output, so this is a function
3.
Inputs: 1, 1, 1, 1
Outputs: 3, 5, 7, 9
For the input value of 1, there is more than one output. 1 is mapped to 4 values, so this is not a function
4.
Inputs: 1, 2, 3, 4
Outputs: 3, 3, 3, 3
Each input is only mapped to one output, so this is a function
