Airplane A carries a package 500 miles West and drops it off at a station after which another airplane carries the same package 450 miles East to the packages drop off point what is the total miles the package went. -500miles + 450miles = -50miles
When a point travels West this is negative on the integer graph and East is positive.
------------------------------------------------------------------------------------------------- West -5 -4 -3 -2 -1 0 1 2 3 4 5 East
