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Réponse :

bonjour

Explications étape par étape

ex 6

7x+17=9x+29

7x-9x=29-17

-2x=12

x=-12/2

x=-6

b)4x+15=7x+24

4x-7x=24-15

-3x=9

x=-9/3

x=-3

c)8x+26=5x+14

8x-5x=14-26

3x=-12

x=-12/3

x=-4

d)23x+31=16x+17

23x-16x=17-31

7x=-14

x=-14/7

x=-2

je te laisse faire ex 7 c'est le même principe

Bonjour,

Exercice 6 :

a. 7x + 17 = 9x + 29

7x - 9x = 29 - 17

-2x = 12

x = -12/2 = -6

b. 4x + 15 = 7x + 24

4x - 7x = 24 - 15

-3x = 9

x = -9/3 = -3

c. 8x + 26 = 5x + 14

8x - 5x = 14 - 26

3x = -12

x = -12/3 = -4

d. 23x + 31 = 16x + 17

23x - 16x = 17 - 31

7x = -14

x = -14/7 = -2

Exercice 7 :

a. -2x + 7 = -x + 9

-2x + x = 9 - 7

-x = 2

x = -2

b. 4x - 21 = 7x - 9

4x - 7x = -9 + 21

-3x = 12

x = -12/3 = -4

c. -7x - 12 = 8x + 3

-7x - 8x = 3 + 12

-15x = 15

x = -1

d. Tu essaies ?

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