Utiliser vecteur directeur ET vecteur normal

This lesson covers how to find both the direction and normal vectors of a given line, and then how to use them to calculate a new line perpendicular to the first passing through a given point. A vector "-b-a" can be used as a direction vector, with a being the coefficient before y. The normal vector can be found from the Cartesian equation of the line through "-b-a". To find the equation of a new line perpendicular to the first, a direction vector can be used as a normal vector for the new line. The equation can then be found by applying the standard formula, using a known point on the new line to solve for the constant. Finally, the reduced equation can be found by isolating for the y variable.