Pls help asap i will mark brainliest if correct tell me which are functions and which arent ♡︎☀︎︎シ

Answer:
1. Yes, it is a function
2. No its not a function 2 cannot equal 3 and 5
3. No, it is not a function 6 cannot equal 3 and 6
4. No, its not a function 6 cannot equal 8 and 4