Two numbers that are the same distance from 0 on the number line, but on opposite sides of it, are called opposites or negatives

Explanation

The figure below shows that for each whole number on the number line, there is a corresponding whole number, called its opposite, to the left of 0. For example, we see that 3 an d-3 are opposites, as are -5 and 5. Note that 0 is its own opposite.