Question

Point x is located at -15 on the real number line. if point y is located at -11, what is the midpoint of line segment xy?

Answer 1

-13 is located in the midpoint of the segment xy
           x       *mp*      y
<----|----|----|----|----|----|----|---->
    -16 -15 -14 -13 -12 -11 -10

Answer 2

All this requires is looking at it. Look, you can make your own number line incredibly easily. (Especially if you make it on graph paper.) Then you put points x and y on the number line. They are four apart. What is -11 - 2?? Why it's -13. The answer is -13 and it's a simple problem that you now know how to do!