Réponse :
bonsoir
2 a + b = 5
- 3 a + 4 b = 10
b = 5 - 2 a
- 3 a + 4 ( 5 -2 a) = 10
- 3 a + 20 - 8 a = 10
- 11 a = 10 - 20
- 11 a = - 10
a = 10/11
2*10/11 + b = 5
b = 5 - 20 /11
b = ( 55 - 20 ) /11 = 35 /11
S ( 10/11 ; 35/11 )
2 * 10/11 + 35/11 = 20/11 + 35/11 = 55 /11 = 5
5 a - 4 b = 10
a - b = 2
a = 2 + b
5 ( 2 + b) - 4 b = 10
10 + 5 b - 4 b = 10
b = 10 - 10 = 0
5 a = 10
a = 2
s ( 2 ; 0 )
Explications étape par étape :
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Réponse :
bonsoir
2 a + b = 5
- 3 a + 4 b = 10
b = 5 - 2 a
- 3 a + 4 ( 5 -2 a) = 10
- 3 a + 20 - 8 a = 10
- 11 a = 10 - 20
- 11 a = - 10
a = 10/11
2*10/11 + b = 5
b = 5 - 20 /11
b = ( 55 - 20 ) /11 = 35 /11
S ( 10/11 ; 35/11 )
2 * 10/11 + 35/11 = 20/11 + 35/11 = 55 /11 = 5
5 a - 4 b = 10
a - b = 2
a = 2 + b
5 ( 2 + b) - 4 b = 10
10 + 5 b - 4 b = 10
b = 10 - 10 = 0
5 a = 10
a = 2
s ( 2 ; 0 )
Explications étape par étape :