Then xa 2-ya 2/2 = 1.
xB^2 - yB^2/2 = 1
Up-down type
xA^2 - xB^2 = (yA^2 - yB^2)/2
(yA - yB)/(xA - xB) = 2(xA + xB)/(yA + yB)
M( 1, 2) is the midpoint of line segment AB.
And xA+xB = 2.
yA+yB = 4
∴
(yA - yB)/(xA - xB) = 1
∴AB slope = 1
The midpoint of AB is (1, 2).
∴AB:y = x + 1
The equation is x-y+ 1=0.
CD is the middle vertical line of line segment AB.
∴CD slope is-1.
The CD equation is x+y-3=0.
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