x-y=2 x^2-y^2=17 x=y+2 (y+2)^2-y^2=17 Решим ур-ие: (y+2)^2-y^2=17 y^2+2y+4-y^2-17=0 2y=13 y=6.5 Найдём x: x=6.5+2=8.5 =======================