bonjour,
f (x) = - 4 x - 7
f ( 8) = 8 * - 4 - 7 = - 32 - 7 = - 39
f ( - 4 ) = - 4 * - 4 - 7 = 16 - 7 = 9
f ( - 2 ) = - 4 - 2 - 7 = 8 - 7 = 1
f ( 3/2) = - 12/2 - 7 = - 6 - 7 = - 13
f ( - 1/3) = 4/3 - 7 = 4/3 - 21/3 = - 17/3
fonctions affines
6 x - 3
x /2 - 5