Решить систему: x^2-y^2=8 x+y=4
X^2-y^2 = 8 x+y = 4 x=4-y (4-y)^2-y^2=8 * * 16 - 8y +y^2-y^2 = 8 -8y = -8 y=1 y=1 x=3