[tex]\displaystyle\bf\\\left \{ {{-3x+5y=-11} \ |\cdot(-1)\atop {8x+5y=11}} \right. \\\\\\+\left \{ {{3x-5y=11} \atop {8x+5y=11}} \right.\\ ----------\\11x=22\\\\x=2\\\\5y=11-8x=11-8\cdot 2=11-16=-5\\\\y=-1\\\\Otvet: \ (2 \ ; \ -1)\\\\\\2)\\\\\left \{ {{2x-3y=9} \atop {x+2y=1} \ |\cdot(-2)} \right. \\\\\\+\left \{ {{2x-3y=9} \atop {-2x-4y=-2}} \right. \\-----------\\-7y=7\\\\y=-1\\\\x=1-2y=1-2\cdot(-1)=1+2=3\\\\Otvet: \ (3 \ ; \ -1)[/tex]

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