aidez moi svp devoir maison​

Réponse :

b) On obtient -13 car (7*(-3)+4) - (5*(-3)+11) = -13

c) Réponse A.

d)

1.

(7x + 4)-(5x + 11) = 0

7x + 4 = 5x + 11

7x + 4 -4 = 5x +11 -4 (LIGNE FACULTATIVE)

7x = 5x + 7

7x -5x = 5x + 7 -5x (LIGNE FACULTATIVE)

2x = 7

x = 3.5

2.

7x + 4 - 5x - 11 = -19

2x - 7 = -19

2x - 7 +7 = -19 +7

2x = -12

x= -6