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BimBamBoum
@BimBamBoum
April 2019
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Bonjour,
Pouvez-vous m'aider à résoudre ce système s'il vous plait:
2x+y=-4
x-y=1
Merci
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nathalienouts
2x+y = -4
x-y = 1
on les additionne
2x+y+x-y = -4+1
3x = -3
x = -3/3
x = -1 et -1-y = 1 soit -y = 1+1 soit y = -2
0 votes
Thanks 0
Commentaires (2)
2x+y=-4
x-y=1
par substitution :
x = y+1 et je remplace x ds
2x+y=-4
2(y+1)+y = -4
2y+2+y = -4
3y = -2-4
3y = -6
y = -2
x-y = 1
x-(-2) = 1
x+2 = 1
x =-2+1
x =-1
verif :
2x+y = -4
-2-2 = -4
1 votes
Thanks 1
ibtissamalem
2x+y=4
ibtissamalem
2x + y=4 x-y=1 2x=4-y x= 4-y/2 (4-y/2)-y=1 x=4-y/2 4-y-2y/2=14-3y=1×2-3y=-2 y=3/2 x=4-3/2÷2x=5/3
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x-y = 1
on les additionne
2x+y+x-y = -4+1
3x = -3
x = -3/3
x = -1 et -1-y = 1 soit -y = 1+1 soit y = -2
x-y=1
par substitution :
x = y+1 et je remplace x ds
2x+y=-4
2(y+1)+y = -4
2y+2+y = -4
3y = -2-4
3y = -6
y = -2
x-y = 1
x-(-2) = 1
x+2 = 1
x =-2+1
x =-1
verif :
2x+y = -4
-2-2 = -4