Choose a number line to model the following situation: after walking 5 steps forward, julie walked 5 steps backward

The number line should look something like this.

|||

-5           0            5

              |>

               <

Let the person is at point O that is at Origin(0).

5 Steps Forward  in terms of Integers = +5

5 steps backward  in terms of Integers = -5

These two numbers are inverses of each other.So, Addition of these numbers yield Zero.