Use the number line to determine the unknown addend in the given number sentence.
–4 + = –9
a. 13
b. 5
c.–5
d. –13

- 4 + (-5) = - 9

Step-by-step explanation:

In the number line when we move x units to the right-hand side, then this means +x movement and moving x units to the left-hand side, then this means -x movement.

Now, in our case it is asked how many units must be added to - 4 to get - 9.

Since -9 is to the left of -4 on the number line, therefore, we have to move by 5 units to the left-hand side i.e. -5 movement.

Therefore, - 4 + (-5) = - 9

⇒ - 4 - 5 = - 9 (Answer)

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step-by-step explanation: