Answer: I think the answer is positive 6.
Explanation:
Let's use the equation on a number line.
If you are adding to a number (this counts for negative or positive numbers) you always move to the right of that number.
If you are subtracting from a number (this counts for negative or positive numbers) you always move to the left of that number.
Take these two questions for example:
1. -7+3=?
On the number line, you start with -7. Since you are adding, you will be moving 3 spaces to the right of -7. So the answer to this question would be -4.
2. -5-3
On the number line, you will start with -5. Since you are subtracting, you will be moving 3 spaces to the left of -5. So the answer to this question would be -2.
Hope this helps!