Équation cartésienne d'une droite avec les coordonnées de 2 points • 2 méthodes à connaître seconde

http://jaicompris.com/lycee/math/droi... Find a Cartesian equation of a line given the coordinates of two points on the line in two ways, using the following: a point M lies on the line passing through A and with direction vector u ⇔ vectors AM and u are collinear ⇔ the determinant of vectors AM and u is equal to 0 if a line d has a direction vector with coordinates (-b; a), then d admits a Cartesian equation of the form ax + by + c = 0 The same exercise with the reduced equation:    • Comment trouver l'équation réduite d'une d...   Math course: second straight line of the plane