Final answer:
To subtract -13 - (-12) using a number line, start at -13 and move to the left by 12 units because we are subtracting a negative number. The result is -25.
Step-by-step explanation:
To subtract -13 - (-12) using a number line, we start at -13 and move to the left by 12 units because we are subtracting a negative number. When moving to the left on the number line, the numbers become smaller in magnitude. So, starting at -13 and moving 12 units to the left gives us -25. Therefore, -13 - (-12) equals -25.