Posted by **ggift** on Sunday, September 20, 2009 at 10:37pm.

I am looking everywhere.....in my notes and in my chapter. What would the other endpoint of a line segment with the given midpoint and one endpoint?

ENDPOINT (0,0) MIDPOINT (2, -8)

- MATH 157 -
**Emily**, Sunday, September 20, 2009 at 11:04pm
Use the midpoint formula:

x coordinate: (1st_x + 1st_y)/2

y coordinate: (2nd_x + 2nd_y)/2

So you could put it into an equation like this:

2 = (0 + x)/2 (for the x coordinate)

-8 = (0+ y)/2 (for the y coordinate)

I know it may have seemed confusing how I wrote it out, so please ask if you need any clarification of my solution.

- MATH 157 -
**Reiny**, Sunday, September 20, 2009 at 11:04pm
let the other endpoint be (a,b)

using the midpoint formula

((a+0)/2,(b+0)/2) = (2,-8)

so a/2 = 2 or a=4

and b/2 = -8, or b = -16

the other endpoint is (4,-16)

check by finding the midpoint between (0,0) and (4,-16)

- MATH 157 -
**ggift**, Monday, September 21, 2009 at 12:43pm
thank you both!!!

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