By equation I x 5 - II x 8 40x- 35y = 675 40x- 48y= 792 –––––––––––––––––––––––– -13y = - 117 ⇒ y = 9From equation I, 8x + 7 x 9 = 135 ⇒ 8x= 135-63 = 72 ⇒ x= 9 From equation III, 9x9 + 8z= 121 ⇒ 82= 121-81 =40 ⇒ z = 5 Clearly, x = y > 2