[tex]\displaystyle\bf\\+\left \{ {{3x+y=-3} \atop {-5x-y=7}} \right. \\--------\\-2x=4\\\\x=-2\\\\y=-3x-3=-3\cdot(-2)-3=6-3=3\\\\Otvet \ : \ (-2 \ ; \ 3)[/tex]
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[tex]\displaystyle\bf\\+\left \{ {{3x+y=-3} \atop {-5x-y=7}} \right. \\--------\\-2x=4\\\\x=-2\\\\y=-3x-3=-3\cdot(-2)-3=6-3=3\\\\Otvet \ : \ (-2 \ ; \ 3)[/tex]