How to find normal vector and direction vector? For example, 5x + 6y-1 = 0, how can we easily see the normal vector and direction vector of this equation?

How to find normal vector and direction vector? For example, 5x + 6y-1 = 0, how can we easily see the normal vector and direction vector of this equation?

The normal vector is the gradient grad of F (x, y) in F (x, y) = 0, which is the vector composed of two partial derivatives derived from X and Y respectively. For this simplest plane straight line, the normal vector is (5,6). The direction is perpendicular to the normal vector, that is (- 6,5) ~