Each of the numbers is the negative (or additive inverse) of the other.
Numbers the same distance from zero (linearly) have the same "absolute value" whether positive or negative.
The easiest way to find the distance between any two numbers on a number line is the bigger number minus the smaller. Here 23 - (-7) = 23+7 = 30. Remember that minus a negative number is the same as plus that number.
Alternates are fill-in-the-blank version of this Q. are the same distance from a point and a line
-6
The set of all points a given distance from a center point is a circle. The given distance is the radius, and the given point is the center. Or, in 3 dimensional space, a sphere.
Absolute value
the absolute value
Integers. They are pretty much any whole number. (This includes negative numbers)
line
They represent the same distance from zero on the number line.
additive inverse
any integer and the negative of that integer... for example 3 and -3 are the same distance from 0
Straight line
The additive inverse.
By numbers at the same distance but on opposite sides of zero.
6 - the same as from 4 to 10.
0 and 4