we have that
The zero is a reference point
so
+3 means -----> 3 units at the right of point x=0 (move forward) ----> final point x=3
-1 -----> 1 unit at the left of point x=3 (move backward) -----> final point x=2
-2 -----> 2 units at the left of point x=2 (move backward) ----> final point x=0
+1 ---->1 unit at the right of point x=0 (move forward) ----> final point x=1
Graph the moves
The first move -----> +3
Second move
-1
Third move
-2
Fourth move
+1
