Question

Срочно!!!Дам 10 забаллов!Спасибо

Answer 1

$\displaystyle 1)\left \{ {{x-2y=5} \atop {2x-3y=9}} \right.\\ \\\left \{ {{x=5+2y} \atop {2x-3y=9}} \right. \\\\2(5+2y)-3y=9\\y=-1\\x=5+2(-1)\\x=3\\(x,y)=(3,-1)\\\\2)\left \{ {{x-3y=8} \atop {2x-3y=10}} \right. \\\\\left \{ {{-3y=8-x} \atop {2x-3y=10}} \right.\\ \\2x+8-x=10\\x=2\\-3y=8-2\\y=-2\\(x,y)=(2,-2)$