geometry
posted by marissa
One endpoint and the midpoint of a segment are given. Find the coordinates of the other endpoint. Show all your work.
A. Endpoint: (1,9)
Midpoint: (9,10)
Endpoint: _______
B. Endpoint: (9,10)
Midpoint: (4,8)
Endpoint: ________

Steve
For x,
9 is 8 below 1
So, the other end is 8 below 9, or 17
Same for y.
The other problem is the same method. 
Henry
A.(x,y), (9,10), (1,9).
9x = 1/2(1x).
182x = 1x.
x = 17.
X = 17.
10y = 1/2(9y).
202y = 9y.
y = 29.
Y = 29.
B. (x,y), (4,8), (9,10).
4x = 1/2(9x).
Multiply both sides by 2, and Solve for x.
8y = 1/2(10y).
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