We are adding positive and negative numbers. The question is State positive or negative or it depends along with my answers.

Are these correct?

Positive + positive: positive
Positive + negative: it depends
Negative + negative: negative
Positive – negative: positive
Negative – positive: it depends

all ok except

negative - positive is always negative

Yes, your answers are correct.

When adding positive numbers to positive numbers, the result is always positive.
When adding positive numbers to negative numbers, whether the result is positive or negative depends on the magnitude of the numbers being added. If the positive number has a greater magnitude than the negative number, the result will be positive. If the negative number has a greater magnitude, the result will be negative.
When adding negative numbers to negative numbers, the result is always negative.
When subtracting a negative number from a positive number, the result is always positive.
When subtracting a positive number from a negative number, whether the result is positive or negative depends on the magnitude of the numbers being subtracted. If the positive number has a greater magnitude than the negative number, the result will be negative. If the negative number has a greater magnitude, the result will be positive.