Ответ: x=-1 ; y=1

[tex]\left \{ {{3x + 2y = - 1 \: \: | \times 3 } \atop { - 9x + 7y = 16 \: \: \: \: \: \: \: \: }} \right. \\ \\ \left \{ {{9x + 6y = - 3} \atop { - 9x + 7y = 16}} \right. + \\ 13y = 13 \\ y = 1 \\ \\ 9x + 6y = - 3 \\ 9x + 6 = - 3 \\ 9x = - 9 \\ x = - 1[/tex]