The sum of two negative integers is a positive integer.
A negative integer is any whole number less than 0.
Take two negative integers:
(a < 0)
(b < 0)
Rule for adding negatives:
((-m) + (-n) = -(m + n))
The sign stays minus, and the sizes add.
Example:
((-3) + (-5))
(= -(3 + 5))
(= -8)
Number line idea:
Starting below 0 and moving left again keeps you left of 0.
Conclusion:
The sum of two negative integers is negative, not positive.