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LilaNeiymar
@LilaNeiymar
April 2019
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Trouver les x et y :
Equations du 1er degré à deux inconnues :
5x - 3 y = -13
2x + 7y = 85
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nathalienouts
5x - 3 y = -13 (x2)
2x + 7y = 85 (x-5)
10x-6y = -26
-10x-35y = -425
on les additionne
10x-6y-10x-35y = -26-425
-41y = -451
y = -451/-41
y = 11
5x -3*11 = -13
5x -33 = -13
5x = 33-13
5x = 20
x = 20/5
x = 4
1 votes
Thanks 1
LilaNeiymar
faut pas trouver 4, c'est faux.
nathalienouts
pourtant, c'est ce que cela donne
LilaNeiymar
non il faut trouver 85
nathalienouts
non c'est 2x + 7y = 85
LilaNeiymar
Ah non d'accord j'ai rien dis, merci
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Lista de comentários
2x + 7y = 85 (x-5)
10x-6y = -26
-10x-35y = -425
on les additionne
10x-6y-10x-35y = -26-425
-41y = -451
y = -451/-41
y = 11
5x -3*11 = -13
5x -33 = -13
5x = 33-13
5x = 20
x = 20/5
x = 4