Is this a function?+ explanation please whoever answers first gets brainiest

Yes
All the first numbers are different so it does not make a vertical line
Answer: Yes, Is a function
Step-by-step explanation:
This is a function because as the term on the left goes up by one, the term on the right goes up by 3.
A function that would represent this is y = 3x
If you plug in 4, you get y = 3(4), which is 12.
Same with 5, 6, 7, and 8.
So yes, this is a function.