Question

which equation could be represented by the number line?
a. $-4 + (-5) = -9$
b. $-1 + (-9) = -10$
c. $9 + (-8) = 1$
d. $-9 + 8 = -1$

Explanation:

Step1: Identify starting point

The right red dot is at $9$, so this is the starting value.

Step2: Identify direction/movement

The arrow points left (negative direction) 8 units, which means we add $-8$.

Step3: Verify the result

Moving 8 left from 9 lands at $1$, so the equation is $9 + (-8) = 1$.

Step4: Match to options

This matches option C.

Answer:

C. $9 + (-8) = 1$