Réponse :
bonjour
1 - 3 x + 4 y = 5
3 x + 2 y = 7
3 x + 4 y = 5 - 1
3 x + 2 y = 7
3 x + 4 y = 4
3 x + 2 y = 7
3 x + 4 y = 4
- 6 x - 4 y = - 14
- 3 x = - 10
x = 10/3
3*10/3 + 4 y = 4
30/3 + 4 y = 4
4 y = 4 - 10
4 y = - 6
y = - 6/4 = - 3/2
S ( 10/3 ; - 3/2 )
- x + 5 y = 7 - 5
5 x + 10 y = 0
- x + 5 y = 2
5 x + 10 y = 0
- 2 x - 10 y = - 4
5 x + 10 y = 0
3 x = - 4
x = - 4/3
- 4/3 + 5 y = 2
5 y = 2 + 4/3
5 y = 6/3 + 4/3 = 10/3
15 y = 10
y = 10/15 = 2/3
- x + 5 (10/15) = 2
- x + 50/15 = 2
- x = 2 - 10/3
- 3 x = 6 - 10
- 3 x = - 4
x = 4/3
S ( 4/3 ; 2/3 )
fais le dernier
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