When we have one negative number substracted from another negative number we can use the fact that the a minus sign can be factorized outside a paranthesis containing the two numbers. Thus inside the paranthesis will remain only two positive numbers that simply add toghether. This way the positive integer numbers are increasing to the right of the real axis, while the negative numbers are increasing in absolute value to the left of real axis.

`-2-8 =-(2+8) =-(10) =-10`