On a number line, this is called the absolute value.
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Opposite numbers.
Absolute value
For two numbers to be equidistant from zero, one must be the negative of the other. As one is the negative of the other, it is the additive inverse of that number. The sum of an number and its additive inverse is zero.
Numbers the same distance from zero (linearly) have the same "absolute value" whether positive or negative.
i think they are called negative numbers.