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3 x - y = 9
x- 4 y = 14
x = 14 + 4 y
3 ( 14 + 4 y) - y = 9
42 + 12 y - y = 9
11 y = 9 - 42
11 y = - 33
y = - 3
x - 4 y = 14
x - 4 * - 3 = 14
x + 12 = 14
x = 14 - 12 = 2
x = 2
3 x - y = 9
6 - ( - 3) = 9
6 + 3 = 9
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6 x + y = 0
4 x - 3 y = - 11
y = - 6 x
4 x - 3 ( - 6 x ) = - 11
4 x + 18 x = - 11
22 x = - 11
x = - 11/22 = - 1/2
6 * - 1/2 + y = 0
y = 6/2 = 3
x = - 1/2 et y = 3
4 x - 3 y = - 11
- 4/2 - 9 = - 2 - 9 = - 11
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