There are two points A(x1, y1) B(x2, y2) whose coordinates of the midpoint P are ((x1+x2)/2, (y1+y2)/2)
In addition: any point (x, y) with respect to (a, b) is (2a-x, 2b-y) and (2a-x, 2b-y) is also on this function.
There is f(2a-x)= 2b-y shift term, there is y=2b- f(2a-x)
X1:8; Y1:9
X2:2; Y2:3
Click "calculation" to output the result
Midpoint: 5,6
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