Answer:
The 3rd table
Explanation:
It can't be the first table because it has 2 for x= -1 & 1, so it is wrong because one x can only have one y!
A linear function has a slope!
The second and fourth table doesn't have a slope, so it is wrong.
Out of those 4 tables, only the 3rd table has a slope!
So, the thrid table is the correct one!