A math problem in senior one, help, it's not difficult.

Let the linear equation y=kx+b, y=kx+2 be brought into the point (2,0).

Let the photographic point (x, y) be from (0, 1) to l.

The formula of the distance between two points is: x 2+(y-1) 2 = 4.

The point (0, 1) and its projection points (x, y) and (2, 0) form a right triangle. From the meaning of the question, we can find the length of each side, which is 2 1 and the root number is 5. Do the math yourself, and then the distance from (x, y) to (2, 0).