Question 95094
Comment: The coordiinates of a midpoint are always the average of the corresponding coordinates of the endpoints.
1) 
endpoint- (4,2) midpoint-(6,0)
Let the endpoint be (x,y)
(4+x)/2=6 and (2+y)/2=0
x = 8  and y = -2
Midpoint is (8,-2)
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2)
endpoint- ( -4,1) midpoint-(-1,3)
Let the midpoint b (x,y)
(x+-4)/2 = -1 and (y+1)/2 = 3
x = 2 and y=5
Midpoint is (2,5)
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Use the same procedure on the following problems.
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3)
endpoint-(-3,6) midpoint- (-4,4)
4)
endpoint-(6,-10) midpoint (-1,2) 
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Cheers,
Stan H.