4y 4 x 2y 6 July 8, 2019 16 32 64 128 X 2y =- 4 3x 4y =- 6 X 2y 4 0 3x =- 4y 6 by cramer's rule X 2y 4 0 3x =- 4y 6 6xy - 4y + 6 - 9x