4 units to the left of 4?
draw your number line and mark it as usual
put your pencil on 4
now move 4 units to the left (subtract)
where are you now?
4 units to left = 4-4 = 0.
4 units to the right = 4+4 = 8.
To find a point that is 4 units to the left of a given point, you need to subtract 4 from the x-coordinate of the given point.
In this case, the given point is 4. So, to find a point that is 4 units to the left of 4, you subtract 4 from 4.
4 - 4 = 0
Therefore, a point that is 4 units to the left of 4 is (0, y), where y can be any value.