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We all know that the direction vector must be required to solve the linear equation in space in universities. Why?
The direction vector of AB is (1,-1).

kab=- 1

Linear equation with AB edge.

y-3=-(x-3)

x+y-6=0

Generally, the direction is changed to slope, such as (a, b) k = b/a, and then the linear equation is written.

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