Answer:
-13 and 13
Step-by-step explanation:
Since its an absolute value we know the answer can be negative or positive, the absolute value makes it positive. Since the answer are negative and positives versions of 5 and 13, lets test both of those as positives, if the positive works then the negative works and if it doesn't work then the negative doesn't work either. Lets start with 5
5-4=9
Subtract
1=9
5 does not work. Lets try 13
13-4=9
Subtract
9=9
13 works, so your answers are -13 and 13
