SOLUTION: I want to ask a queation please check to see if this is correct .If M (-7,-3) is the midpoint of segment PQ and the coordinates of Q and are(6,-3).fine the coordinates of Q .

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Question 74263: I want to ask a queation please check to see if this is correct .If M (-7,-3) is the midpoint of segment PQ and the coordinates of Q and are(6,-3).fine the coordinates of Q .
Please see if my problem is correct .Thanks .
M(-7,-3)(6,-3)
7=3= -10 6/3=2
so if -10*2=20
so the P IS -20.-3

Answer by Cintchr(481)   (Show Source): You can put this solution on YOUR website!
P = (x , y)
M = (-7 , -3)
Q = (6 , -3)

Midpoint = ( , )
work the X values first

Cross multiply

subtract 6


Now work the Y values

Cross multiply

multiply

add 3


Midpoint = (-20 , -3)

Your method does work as well since the Y coordinates are the same, the line is a horizontal line. Your method will not work unless the line is horizontal or vertical.

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