Mid-way between 3 and 7 on the number line is their average, .
Numbers that are more than units away from are
either to the left of as is
or to the right of as in .
Absolute value of a difference of two numbers is the distance between those two numbers on the number line.
Inequalities that use absolute value of
can have solutions that includes numbers at less than a certain distance from the number or at more than a certain distance from the number.
<--> means numbers less than units away from <--> means numbers more than units away from