Final answer:
To find the missing value, start at -9 on the number line and count 5 units to the right to reach -4.
Step-by-step explanation:
To find the missing value, we can use the number line. We know that -4 is equal to -9 plus the missing value.
So, to find the missing value, we can start at -9 on the number line and count 5 units to the right to reach -4.
Therefore, the missing value is -4 + 5 = 1.