Answer:
First table's unit rate is -1.6
Second table's unit rate is 3.5
Explanation:
First table:

and this is constant for any pair of (x, y) values of the table.
So the unit rate is: -8/5 = -1.6
Second table:

and the rate is constant for any pair of (x, y) values of the table.
So the unit rate is: 7/2 = 3.5