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2 x - y = 7
x + y = 5
x = 5 - y
2 ( 5 - y) - y = 7
10 - 2 y - y = 7
- 3 y = 7 - 10
- 3 y = - 3
y = 1
x + 1 = 5
x = 4
S ( 4 ; 1 )
2 x - 5 y = - 21
3 x - 4 y = 7
- 6 x + 15 y = 63
6 x - 8 y = 14
7 y = 77
y = 11
2 x - 5 *11 = - 21
2 x = - 21 + 55
2 x = 34
x = 17
S ( 17 : 11 )
3*17 - 4 *11 = 7
51 - 44 = 7
7 = 7
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bonsoir
2 x - y = 7
x + y = 5
x = 5 - y
2 ( 5 - y) - y = 7
10 - 2 y - y = 7
- 3 y = 7 - 10
- 3 y = - 3
y = 1
x + 1 = 5
x = 4
S ( 4 ; 1 )
2 x - 5 y = - 21
3 x - 4 y = 7
- 6 x + 15 y = 63
6 x - 8 y = 14
7 y = 77
y = 11
2 x - 5 *11 = - 21
2 x = - 21 + 55
2 x = 34
x = 17
S ( 17 : 11 )
3 x - 4 y = 7
3*17 - 4 *11 = 7
51 - 44 = 7
7 = 7