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Virginielagran
@Virginielagran
May 2019
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Résoudre équation système à deux inconnues
3y= 6
- 7x + 9y = 21
Je sais que y=2 mais je n'arrive pas à trouver x
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ficanas06
Verified answer
3y=6
y=6/3 = 2
tu remplaces y par sa valeur dans la 2e équation:
-7x + (9*2) =21
-7x + 18= 21
-7x = 21-18
-7x= 3
x= -3/7
1 votes
Thanks 0
douae5
-7x+9+2=21
-7x+11=21
-7x=21-11
-7x=10
x=10÷7
0 votes
Thanks 0
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Verified answer
3y=6y=6/3 = 2
tu remplaces y par sa valeur dans la 2e équation:
-7x + (9*2) =21
-7x + 18= 21
-7x = 21-18
-7x= 3
x= -3/7
-7x+11=21
-7x=21-11
-7x=10
x=10÷7