By equation II x 2 - equation (I) 8x+6y = 118 7x-6 y = 110 –––––––––––––––––––––––– x = 8 From equation (I), 7x8-6y = 110 ⇒ 6y = 110-56 = 54 ⇒ y = 9 From equation (III), 8+z=15 ⇒z=7 Clearly, x < y > z