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Sagot :

1. C. there is no solution
2. B. inconsistent
3. 6x + 6y = -6   ⇒ 30x + 30y = -30
    5x + 1y = -13 ⇒ 30x +  6y  = -78
                                         24y = 48
                                          24     24
                                             y = 2
                                 6x + 6(2) = -6
                                   6x + 12 = -6
                                          -12    -12
                                           6x = -18
                                            6       6
                                             x = -3
                                       (x, y) = (-3,2)