Le plan est muni d'un repère orthonormé (O; I;]) 1. Soit g un fonction linéaire tel que g(2) = 1 a- Construire la droite (G) représentation graphique de la fonction g. b- Déterminer graphiquement g(-2). c- Déterminer graphiquement l'antécédent de 2 par la fonction g. d- Déterminer g en fonction de x. 2. Soit f la fonction affine définie par : f(2) f(8) 12 et f(2) = 3 a- Montrer que f(x) = -2x+7 b- Tracer la droite (F) la représentation graphique de la fonction f. c- Montrer que les deux droites (F) et (G) sont perpendiculaires.

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