Yang bagian D dong bisa dibantu

[tex] {x}^{2} - 2 {y}^{2} = - 2 | \times 3| \\ 3 {x}^{2} + {y}^{2} = 57 | \times 1| \\ - - - - - - - - - - \\ 3 {x}^{2} - 6 {y}^{2} = - 6 \\ 3 {x}^{2} + {y}^{2} = 57 \\ - - - - - - - ( - ) \\ - 7 {y}^{2} = - 63 \\ {y}^{2} = 9 \\ cari \: {x}^{2} \\ {x}^{2} - 2(9) = - 2 \\ {x}^{2} - 18 = - 2 \\ {x}^{2} = 16 \\ jadi \\ {x}^{2} = 16 \\ x = 4 \\ dan \\ {y}^{2} = 9 \\ y = 3 [/tex]
Maaf kalo salah, semoga membantu