<PRE><B>Question 12450</B>
          x   +    y +   2z =5 ............. .(1) 
          x   +   2y +   z = 8 ............(2)
         2x   +   3y -   z = 1 ...........(3)



         x    +     y +  2z= 5....................(4)
                    y -   z= 3......{subtract(2)from(1)}.............(5)
                    y -  5z= -9....................(6)



        x + y + 2 z = 5.........................(7)
             y - z = 3........................(8)
               -4z = - 12............{subtract(6)from(5)}.................(9)





       x + 3 z = 2...{ subtract (7) from (8) }..........................(10)
       + y - z = 3.............................(11)
           -4z = -12..........................(12)





    x +   3z = 2.....................(13)
      +y - z =3......................(14)
          z =3.........{divide (12) by -4 }....................(15)





    x +  3z = 2.....................(16)
       y    =6.......{add(14)&amp;(15)}.............(15)
          z=3....................(18)



          x =-7....{subtract 3*(18) from (16)}.............(19)
          y =6..........................................(20)
          z =3...............................(21)

    ANSWERS:
         x=-7
         y=6
         z=3

              





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