Answer:
k=3
Step-by-step explanation:
k-6=-3
k-6+6=-3+6
k = 2
Step-by-step exeplayion
image a numner line, something minus 6 is -3. the number below in the number line and you go 6 down to get to -9, therefore k = 2
2
1
0
-1
-2
-3
