Answer:
With a number line with two points opposite from each other on a number line, the middle of it is always going to be 0. Therefore, both points are the same distance away from 0 just in opposite directions. That means point Q is always going to equal the negative of point P. An example of this is if point p equals 5, point p equals -5.
This method only works when it is specifically stated that the two points are opposite from each other.
Hope this helps!
xx,
myara
