х+у=-7 х^2+y^2=25 1) x=-7-y (-7-y)^2+y^2=25 49+7y+7y+y^2-25=0 ; 2y^2+14y+24=0 2); y^2+7y+12=0; D=49-48-1; D>0 ; y=(-7+1)/2 y=(-7-1)\2 y=-3 y=-4 2) x=-7-(-3) X=-7+(-3) x=-4 y=-3 x=-4 y=-3