MathematicsMedium244×since 2002Q4576If the system of linear equations x + y + 3z = 0 x + 3y + k²z = 0 3x + y + 3z = 0 has a non-zero solution (x, y, z) for some k ∈\in∈ R, then x + (yz)\left( {{y \over z}} \right)(zy) is equal to :A9B3C-9D-3Check answerSkip