bonjour qui peut m aider pour l exercice 14 et 15 en maths car je n y arrive pas aidez moi svpl merci d avance​

bonjour

f (x) = - 4 x -  7

f ( 8) = - 4*8 - 7 = - 32 - 7 = - 39

f ( - 4) = - 4 * -4 - 7 = 16 - 7 = 9

f ( - 2 ) = 8 - 7 = 1

f ( 3/2) = - 4 *3/2 - 7 = - 12/2 - 7 = - 6 - 7 = - 13

f ( - 1/3) = - 4 * - 1/3 - 7 =  4/3 - 21/3 = - 17/3

fonctions affines

f (x) = 6 x - 3

k ( x) = x/2 - 5

f(x) = -4x - 7

si x = 8 => f(8) = -4*8 - 7 = -32 - 7 = -39

si x = -4 => f(-4) = -4*(-4) - 7 = 16 - 7 = 9

si x = -2 => f(-2) = -4*(-2) - 7 = 8 + 7 = 1

si x = 3/2 => f(3/2) = -4*3/2 - 7 = -6 - 7 = - 13

si x = -1/3 => f(-1/3) = -4*(-1/3) - 7 = 4/3 - 7 = 4/3 - 21/3 = -17/3

fonction affine :

selon ton cours : a la forme : f(x) = ax + b

a = oui

b = non

c = non

d = oui puisque k(x) = 1/2x - 5