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Flo25
@Flo25
April 2019
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Résous les systèmes suivants en utilisant la méthode par substitution ::
1) 6x + y = 8
10x + 7y = -8
2) 7x + 4y = -5
x + 3y = 9
sachant que : y = -6x+8 ET x= -3y+9
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winner123
Verified answer
Bonjour
6 x +y = 8
10 x +7 y = - 8
- 42 x - 7 y = - 56
10 x + 7 y = - 8
- 32 x = - 64
x = 2
6 x + y = 8
12 + y = 8
y = 8 -12
y = -4
x = 2 et y = -4
7 x +4 y = - 5
x + 3 y = 9
7 x + 4 y = - 5
- 7 x - 21 y = - 63
- 17 y = - 68
y = 4
7 x + 16 = - 5
7 x = - 5 -16
7x = - 21
x = - 3
x = - 3 et y = 4
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Verified answer
Bonjour6 x +y = 8
10 x +7 y = - 8
- 42 x - 7 y = - 56
10 x + 7 y = - 8
- 32 x = - 64
x = 2
6 x + y = 8
12 + y = 8
y = 8 -12
y = -4
x = 2 et y = -4
7 x +4 y = - 5
x + 3 y = 9
7 x + 4 y = - 5
- 7 x - 21 y = - 63
- 17 y = - 68
y = 4
7 x + 16 = - 5
7 x = - 5 -16
7x = - 21
x = - 3
x = - 3 et y = 4