The reason for this is the following:
From the folding,
Say it again,
(2) Let AE=3t,
AD=4t。
See DE=5t from Pythagorean Theorem.
From (1),
In,,
T= 1。
OC=8, AE=3, and the coordinate of point C is (0,8).
The coordinates of point E are (10,3),
Let the analytical formula of straight line CE be y=kx+b,
solve
The coordinate of point p is (16,0).
(3) There are two straight lines L satisfying the condition: y =-2x+ 12,
y=2x- 12 .
Let me sweat first. This does not need to be analyzed. The slope is constant, so are the absolute values of a and b. Aren't these two lines?