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LilaNeiymar
@LilaNeiymar
April 2019
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Trouver les x et les y .
Equation du 1er degré à 2 inconnues.
3x + 8 y = 83
9x + 4y = 49
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Sovehord
Allez, je vais t'aider!!! Gentils non? ahah! Allons-y
3x + 8y = 83 x (-3) (1)
9x + 4y = 49 x1 (2)
On multiplie, ceci nous égal à .. :
-9x + ( -24y) = -249 (1)
9x + 4y = 49 (2)
On additionne : (1) + (2)
-9x - 24y + 9x + 4y = 49-249
-20y + 0x = -200
-20y/-20 = -200/-20
y = 10
Dans (1), on remplace :
3x + 8y ( qui donc on remplace par 10 ) = 83
3x + 8x10 = 83
3x + 80 = 83
3x + 80 ( -80 ) = 83-80
3x = 3
3x/3 = 3/3
X = 1
La solution de ce système d'équation est de : ( 1 ; 10 ) !!!
2 votes
Thanks 1
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3x + 8y = 83 x (-3) (1)
9x + 4y = 49 x1 (2)
On multiplie, ceci nous égal à .. :
-9x + ( -24y) = -249 (1)
9x + 4y = 49 (2)
On additionne : (1) + (2)
-9x - 24y + 9x + 4y = 49-249
-20y + 0x = -200
-20y/-20 = -200/-20
y = 10
Dans (1), on remplace :
3x + 8y ( qui donc on remplace par 10 ) = 83
3x + 8x10 = 83
3x + 80 = 83
3x + 80 ( -80 ) = 83-80
3x = 3
3x/3 = 3/3
X = 1
La solution de ce système d'équation est de : ( 1 ; 10 ) !!!