bonjour
f (x) = x - 4
f ( 1) = 1 - 4 = - 3
f ( 2 ) = 2 - 4 = - 2
f (x) = - 2 x + 3
f ( 0 ) = 3
f ( 2 ) = 2 - 2 + 3 = - 4 + 3 = - 1
f ( x) = 2
f ( 0) = 2
f ( 2 ) = 2 la fonction est constante
f ( x) = 2 x / 3
f ( 1 ) = 2 / 3
f ( 6 ) = 6 * 2/3 = 12/3 = 4
voilà , tu as 2 points par fonction pour tracer
