Draw a coordinate line, taking 1 cm as a unit segment. Mark on it points A (-2) and B (1).

According to the requirements of the assignment, we draw a coordinate line, taking 1 cm as a unit segment (two cells of a school notebook). We indicate on it the origin O (0) and the direction (it is indicated by an arrow). Draw the letter x near the arrow.
Since the –2 coordinate of point A is negative, this point will be located to the left of the origin point O (0). However, coordinate 1 of point B is positive, so this point will be located to the right of the origin point O (0).
Let us now determine the remoteness of the location on the line Ox of points A and B from the reference point O (0). Since, for our example, the unit segment is 1 cm (2 cells), point A (–2) is 2 * 1 cm = 2 cm away from point O (2 * 2 = 4 cells). Similarly, we find the location of point B (1): 1 cm (1 * 2 = 2 cells).