Question 715034
The midpoint of the line segment ST has coordinates (3,6). If S is the point (4,1), find the coordinates of T. 
I'm obviously stuck with this question though I did attempt to do it. 
Here's my working out. 
Let the coordinate of T be (x,y)
Then by the midpoint formula ((x+3)/2, (y+6)/2)=(4,1) 
Midpoint formula for x.
(x+4)/2=3
x+4 = 6
x = 2
--------
(y+1)/2 = 6
y+1 = 12
y = 11
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Note: Parentheses make a difference.
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Cheers,
Stan H.