When subtracting integers we have to use the rule:TO SUBTRACT INTEGERS, "WE ADD THE OPPOSITE"
after you change the opposites you must follow the rule in adding integers.
There is another way to subtract integers and that is using the algebra tiles.
You need to draw the algebra tiles that represents the equation.
Then you need to find the the zero pair of the integer like showed in the diagram then
take away the integer that is really there and replace it with the opposite integer, for example -3 replace it with +3..... that is what I meant about replacing it with the opposite integer.
1)( - 2 )-( - 3 ) = +5
Here is a great video so you can understand more about subtracting integers......
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