-10 - (-8)
Copy the subtrahend, Change the operation, then, Change the sign of the minuend. Therefore, the operation will be addition, follow the rules in adding integers. Subtract the integers then the integer having higher absolute value's sign will be followed.
-10 8 = -2
10 - 8 = 2; because -10 has the higher absolute value, the difference will be negative (it's sign was followed.)

And the answer to your question is -2. ^-^ 

Please, kindly correct me I'm wrong. ^-^