Answer:
D
Step-by-step explanation:
A: Not A. It can be graphed. It is a vertical line where x = 3. Every point must have an x value of 3. (3,4), (3,0), (3.- 6) are all on x = 4. It can be graphed, but it is not a function.
B: Not B. It is not a function at all. To be a function, it can only have 1 y value associated with it.
C: It's not a linear function because it is not a function.
D is your answer