It would be 6. If you substitute 1 and -3 into their assigned letters, you would get 6 as your final answer. the two lines mean it is an absolute value, which means any negative number would turn into a positive number
2 minus negative 3 would equal 5 because positive minus negative equals positive and you are using absolute value. 1 minus 2 would equal -1 but the absolute value is 1 so the answer is 1.
