Question

use the number line to help solve the problem.
subtract -6 - 3
-9
9
3
-3

Explanation:

Step1: Recall subtraction on number line

To subtract \(a - b\) on a number line, start at \(a\) and move \(b\) units to the left (since subtraction of a positive number means moving left). Here, we need to solve \(-6 - 3\), so start at \(-6\).

Step2: Move on number line

Starting at \(-6\), we move 3 units to the left (because we are subtracting 3, a positive number). Moving left from \(-6\): first move to \(-7\) (1st unit), then \(-8\) (2nd unit), then \(-9\) (3rd unit). Alternatively, using the rule of subtraction: \( -6 - 3=-6+(-3)=-9\) (since subtracting a number is adding its opposite).

Answer:

-9 (corresponding to the option: -9)