Pearson Geometry Common Core, 2011
PG
Pearson Geometry Common Core, 2011 View details
7. Midpoint and Distance in the Coordinate Plane
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Exercise 7 Page 54

Take the mean of given endpoints.

-1.5

Practice makes perfect
To find the midpoint, we can take the mean of given endpoints. M=a+b/2The coordinates of the given endpoints are -9 and 6. Let's use these to find the coordinates of the midpoint.
M=a+b/2
M=-9+ 6/2
M=-3/2
M=-1.5
The midpoint is located at -1.5.