Answer:
In/out
-18, -19
-17, -18
-15, -16
-7, -8
0, -1
14, 13
Explanation:
the rule states "subtract 1" so if you look at the In, -15 for example goes to -16 for the out which proves that -15-1 is -16. so for all the In's you subtract each number by 1. to FIND a In from the out you just add 1. So just follow the rules and look at the rules carefully!