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Sagot :

INEQUATION

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Résoudre:

{ x+2y+3=0

{2x-3y+4=0

{ x+2y= -3       (-2)

{2x-3y= -4        (1)

-2x-4y=  6

2x-3y= -4

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     -7y= 2

y= -2/7

x+2y= -3  

x+2(-2/7)= -3

x-4/7= -3

x= -3+4/7

x= (-3*7+4)/7

x= -17/7

S ( -17/7 ; -2/7 )

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