Look at this table:
Is this relation a function?
| x | y |
| 20 | 16 |
| 20 | 19 |
| 7 | 20 |
Is this relation a function?
yes
no
ref_doc_title.
Jumping to level 1 of 1
Excellent!
Now entering the Challenge Zone—are you ready?
| x | y |
| 20 | 16 |
| 20 | 19 |
| 7 | 20 |
Now entering the Challenge Zone—are you ready?