[tex]\displaystyle\bf\\\left \{ {{3x+y=1} \atop {2x-3y=-14}} \right. \\\\\\\left \{ {{y=1-3x} \atop {2x-3\cdot(1-3x)=-14}} \right. \\\\\\\left \{ {{y=1-3x} \atop {2x-3+9x=-14}} \right. \\\\\\\left \{ {{y=1-3x} \atop {11x=-11}} \right. \\\\\\\left \{ {{x=-1} \atop {y=1-3\cdot(-1)}} \right. \\\\\\\left \{ {{x=-1} \atop {y=1+3}} \right. \\\\\\\left \{ {{x=-1} \atop {y=4}} \right. \\\\\\Otvet \ : \ (-1 \ ; \ 4)[/tex]