{x-y=-5 {x²-2xy-y²=17 x-y=-5 x=y-5 x²-2xy-y²=17 (x²-y²)-2xy=17 (x-y)(x+y)-2xy=17 -5(x+y)-2xy=17 -5x-5y-2xy=17 -5(y-5)-5y-2y(y-5)=17 -5y+25-5y-2y²+10y=17 -2y²+25=17 -2y²=17-25 -2y²=-8 y²=4 y₁=2 x₁=2-5=-3 y₂=-2 x₂=-2-5=-7 Ответ: x=-3 y=2 x=-7 y=-2