5y 4 )( 5y 8 July 8, 2019 16 32 64 128 3x 5y 4 x 5y 8 3x 5y 4 x 5y 8 elimination method 4 5y =- 2 8 5y 5 4 5y 8 2 5y 16 (4 5-y)×5 8=8 7
