Answer:
The relation cannot be a function if k=-9 or k=7
Explanation:
For any relation not to be a function, one domain value should return more than one range.
==> 2-|k+1| = -6
Adding -2 on both sides,
-|k+1| = -8
Multiplying by (-1) on both sides,
|k+1| = 8
k+1 = 8 ; -k-1 = 8
k = 7 ; -k=9 => k=-9
k=7 or k=-9