In math when you are given a negative and a positive number, you should write down the sign of the greatest number and subtract the smaller number from the greatest number. In the problem 3 - 9, three is the positive number, and nine is the negative number. This means you should write down the negative number's sign and subtract 3 from 9, and your answer should be -6.
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Negative answer if the negative number is bigger. Positive answer if the positive number is bigger.
Because "minus a negative" is tha same as "plus a positive". So, a positive minus a negative is a positive plus a positive which is a positive.
1 plus negative 10 is equal to -9.
negative 2
negative 4