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ebru7158
@ebru7158
January 2021
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Bonjour je n'arrive pas aidez moi svp merci d'avance c'est un exercice ou il faut resoudre de système d equation je n'arrive pas svpp pouvez vous m'aider merci beaucoup c'est lexercice 64 svp ce serait gentil merci
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Christine17
A)
y=x-3
2x+y=3
2x+x-3=3
3x=6
x=2 et donc y=-1
b)
x-2y=-7 donc x=-7+2y
2x-y=-5
2x-y=-5
2(-7+2y)-y=-5
-14+4y-y=-5
3y=-5+14=9
y=3 donc x=-7+6=-1
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y=x-3
2x+y=3
2x+x-3=3
3x=6
x=2 et donc y=-1
b)
x-2y=-7 donc x=-7+2y
2x-y=-5
2x-y=-5
2(-7+2y)-y=-5
-14+4y-y=-5
3y=-5+14=9
y=3 donc x=-7+6=-1