X 3y 4 2x y =- 6 July 8, 2019 16 32 64 128 1 2x 3y 4 for x when y 6 X y 4 2x 3y 6 3x 4y 7 X y 6 2x 3y 4 by substitution method X 3y 6 y ≥ 2x 4 X y 6 2x 3y 4 by elimination method 2x y 4 x 3y 6 graph X 4 y 5 và 2x 3y 69 3x + 2y = 6 6xy - 4y + 6 - 9x
