Réponse :

Explications étape par étape

Bonsoir

11 = 7y - 2

11 + 2 = 7y - 2 + 2

13 = 7y

13/7 = 7y/7

y = 13/7

-3 = 6z - 13

-3 + 13 = 6z - 13 + 13

10 = 6z

10/6 = 6z/6

(2 x 5)/(2 x 3) = z

z = 5/3

t/4 + 15 = 8

t/4 + 15 - 15 = 8 - 15

t/4 = -7

4t/4 = -7 * 4

t = -28

3y + 4 = 9

3y + 4 - 4 = 9 - 4

3y = 5

3y/3 = 5/3

y = 5/3

12 = 3/2 w + 14

12 - 14 = 3/2 w + 14 - 14

-2 = 3/2 w

-2 * 2/3 = 3/2 w * 2/3

w = -4/3