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The point with coordinates (5,-11) is the midpoint of the segment with one endpoint at (9,7). Find the sum of the coordinates of the other endpoint.

 Mar 22, 2021
 #1
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Let  the other endpoint  be  ( x, y)

 

And we  have that

 

(9 + x)  / 2  =   5               ( 7 + y) / 2  =  -11

 

9 + x  = 5*2                       7 +  y  =  -11*2

 

9 + x  =10                           7 + y  = -22

 

x = 10 -9   = 1                      y  =  -22  - 7  =  -29

 

(x, y ) =  ( 1, -29)

 

 

cool cool cool

 Mar 22, 2021

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