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Bonjour,

a) 5x = 3x + 3

5x - 3x = 3

2x = 3

x = 3/2

b) 8 x = 12x + 4

8x - 12x = 4

- 4x = 4

x = - 4/4

x = - 1

c ) 4 - 7y = 10y

- 7y - 10y = - 4

- 17y = - 4

y = 4/17

d) (x + 1 ) ( x - 8 ) = 0

x + 1 = 0                     ou                  x - 8 = 0

x = - 1                                                x = 8

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Réponse :

bonjour

Explications étape par étape

a) 5x = 3x+3

5x-3x=3

2x=3

x=3/2

x=1.5

b) 8x = 12x+4

8x-12x=4

-4x=4

x=-1

c ) 4-7y = 10y

-7y-10y=-4

-17y=-4

y=4/17

d) (x + 1 ) ( x - 8 ) = 0

x+1=0         x-8=0

x=-1              x=8