Which of the two points B or M is located on the coordinate line to the right if B (-68) and M (-90)?

The coordinate axis is the directional vector.
The numbers on the coordinate line are arranged in ascending order from left to right. That is, on the left there are numbers with smaller values, on the right with large values.
Since -68> -90, therefore point B will be located to the right of point M. This can be easily seen on the diagram:
——- (- 90) ———- (- 68) —————- (0) —— ——->
Answer: point B (-68) is located on the coordinate axis to the right of point M (-90).