Complete the function table. Then write a rule for the function.

Question

Input
-3
-2
-1
0
1

Output
-
-4
-
-
-1

Answer 1

Rule: If the input is negative, output a dash. If the input is 0, output a dash. For any positive input, output the input decreased by 1.

Output = { - if input < 0 or input = 0, input - 1 if input > 0 }

Alternatively:

- If input is less than or equal to -1, output dash.
- If input is greater than or equal to 1, output input - 1.
- If input is 0, output dash.

Output = { - if input ≤ -1, - if input = 0, input - 1 if input ≥ 1 }