Y 4 2x 3y July 8, 2019 16 32 64 128 Y =- 4 2x 3y 8 X y 4 2x 3y 3 X y 4 2x 3y X y 4 2x 3y 6 X y 4 2x 3y 9 Y 3x =- 4 2x 3y =- 21 X y 4 2x 3y 7 3x y 4 2x 3y 10 5x y 4 2x 3y 5 X y 4 2x 3y 10 3x y 4 2x 3y 5 Y 2x 4 6x 3y 12 2x y 4 x 3y =- 5 Y 2x 4 3y 21x 15 X y 4 2x 3y 3 by substitution method