Bjr ou bsr je voudrais que vous m'aidiez pour un devoir en math. Exercice1: Résoudre les équations suivantes. 2×-3=4+× Y+4=-4-3y 7×-6=4-3× 12-a=18-3a -t-4=8+7t

bonjour

2 x - 3 = 4  + x

2 x - x = 4 + 3

x = 7

y + 4 =  - 4 - 3 y

y + 3 y = - 4 - 4

4 y = - 8

y = - 2

7 x - 6 = 4 - 3 x

7 x + 3 x = 4 + 6

10 x = 10

x = 1

12 - a =  18 - 3 a

- a + 3 a = 18 - 12

2 a = 6

a = 3

- t - 4 = 8 + 7 t

- t - 7t = 8 + 4

- 8 t = 12

t = - 12/8 = -  3/ 2

13 x + 11 = 8 x + 28

13 x - 8 x = 28 - 11

5 x = 17

x = 17/5

continue, tu devrais avoir saisi la méthode

Bonjour,

Explications étape par étape:

2x - 3 = 4 + x

2x - x = 3 +4

x = 7

y + 4 = -4 - 3y

y + 3y = -4 - 4

4y = - 8

y = -8/4

y = -2

7x - 6 = 4 - 3x

7x + 3x = 4 + 6

10x = 10

x = 10/10

x = 1

12 - a = 18 - 3a

-a + 3a = 18 - 12

2a = 6

a = 6/2

a = 3

-t - 4 = 8 + 7t

-4 - 8 = 7t + t

-12 = 8t

-12/8 = t

13x + 11 = 8x + 28

13x - 8x = 28 - 11

5x = 17

x = 17/5

7y + 22 = 14 - 4y

7y + 4y = 14 - 22

11y = -8

y = -8/11

x + 4 = -12

x = -12 - 4

x = -16

2/3x = 90

x = 90× 3/2

x = 135

5x = 45

x = 45/5

x = 9