When you have a minus and a plus sign together, you simply ignore the plus sign. For example -5 + -3 is the same as -5 - 3 which is -8.
If you have two minus signs together, you replace them with a plus sign. For example -5 - -3 is the same as -5 + 3 which gives -2.
At school I learned a simple rule: 'Minus a minus is a plus'
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The answer is negative
Multiply it by another negative number. Or add a higher positive number to it.
-n+-n=-2n so -1+-1=-2. In simple terms a negative plus a negative eqauls a negative. You can just add the numbers as if they are positive and then add a negative sign to the answer.
if they are both negative, add like they are positive numbers, but just add the negative sign.
Adding two negative numbers always gives a negative number.