Answer:
Negative plus Negative would equal positive in Maths. like this:
-7 + -8 = 1
Because you're adding a minus
It Will Not Equal a Positive it will Equal a Negative. -7+-8= -15. Because you are adding a negative to another negative.
If the problem was -7+8= 1. Because you are taking seven out of that eight.
If It were to be multiplication than a negative TIMES a negative would have been a positive(-8 x -7=56). And a negative TIMES a positive would be a negative (-8 x 7=-56).