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bellalea
@bellalea
January 2021
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bonjour, pouvez vous m'aider svp!
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maudmarine
Verified answer
Bonjour,
1)
5x - 2y = - 9
7x - y = 18
- y = 18 - 7x
y = - 18 + 7x
5x - 2 (- 18 + 7x) = - 9
5x + 36 - 14x = - 9
- 9x = - 9 - 36
- 9x = - 45
x = 45/9
x = 5
7x - y = 18
7 (5) - y = 18
35 - y = 18
- y = 18 - 35
- y = - 17
y = 17
Le solutions sont : (5 ; 17)
2)
x + 3 / y + 3 = 2/5
x - 3 / y - 3 = 1/7
5x + 15 = 2y + 6
7x - 21 = y - 3
5x - 2y = - 15 + 6 =
- 9
7x - y = 21 - 3 =
18
5x - 2y = - 9
- 2 (7x - y) = 18
5x - 2y = - 9
- 14x + 2y = - 36
- 9x = - 45
x = 45/9
x = 5
5x - 2y = - 9
25 - 2y = - 9
- 2y = - 25 - 9
- 2y = - 34
y = 34/2
y = 17
1 votes
Thanks 1
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Lista de comentários
Verified answer
Bonjour,1)
5x - 2y = - 9
7x - y = 18
- y = 18 - 7x
y = - 18 + 7x
5x - 2 (- 18 + 7x) = - 9
5x + 36 - 14x = - 9
- 9x = - 9 - 36
- 9x = - 45
x = 45/9
x = 5
7x - y = 18
7 (5) - y = 18
35 - y = 18
- y = 18 - 35
- y = - 17
y = 17
Le solutions sont : (5 ; 17)
2)
x + 3 / y + 3 = 2/5
x - 3 / y - 3 = 1/7
5x + 15 = 2y + 6
7x - 21 = y - 3
5x - 2y = - 15 + 6 = - 9
7x - y = 21 - 3 = 18
5x - 2y = - 9
- 2 (7x - y) = 18
5x - 2y = - 9
- 14x + 2y = - 36
- 9x = - 45
x = 45/9
x = 5
5x - 2y = - 9
25 - 2y = - 9
- 2y = - 25 - 9
- 2y = - 34
y = 34/2
y = 17