+0  
 
+2
178
3
avatar+230 

A line segment has one endpoint at (3,9) and midpoint at (1,2) . What is the sum of the coordinates of the other endpoint?

ant101  Mar 23, 2017
Sort: 

3+0 Answers

 #1
avatar+79689 
+1

We have

 

( 3 + x) / 2  =  1          and              (9 + y ) / 2  =  2

 

Multiply both side by 2

 

3 + x   = 2                   and               9 + y   =  4

 

subtract 3 from both sides              subtract 9 from both sides

 

x  = -1                                              y  =  -5

 

This is the other endpoint

 

And the sum of its coordinates  =  -6

 

 

 

cool cool cool

CPhill  Mar 23, 2017
 #2
avatar+230 
+1

Thanks so much! Your're so smart!

ant101  Mar 23, 2017
 #3
avatar+2 
+1

The answer would be -6, you're right

algebrarocks  Mar 23, 2017
edited by algebrarocks  Mar 23, 2017

26 Online Users

avatar
avatar
avatar
avatar
We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  See details