Find the equation of the tree and the ground — task. Mathematics State Board, Class 10.

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A tree fell in half due to the storm, which forms the shape of a triangle. The coordinates of the top of the tree is at

$B(1,8)$ . The inclination of the broken arm of the tree to the ground forms an angle of 45

$^{\circ}$ .

The equation of the line

$BC$ is

$- x + y -9 = 0$
$- x - y -9 = 0$
$x - y -9 = 0$
$x + y -9 = 0$

$1$

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