x + y + z = 8 -------- eq (i)

 ------ eq (ii)

3z - 3y - 2x = 7_____- 2x - 3y + 3z = 7 ----- eq (iii)

3x + 3y + 3z = 24 ---- Multiplying eq (i) by 3 ------- eq (iv)

3x - y + 4z = 21 ----- Multiplying eq (ii) by 3 ------ eq (v)

   x  + 6z = 31 ------ Adding eqs (iii) & (iv) ------- eq (vi)

  4x  + 5z = 29 ------ Adding eqs (i) & (v) ---------- eq (vii)

- 4x - 24z = - 124 --- Multiplying eq (vi) by - 4 ---- eq (viii)

- 19z = - 95 --------- Adding eqs (viii) & (vii)





x + 6(5) = 31 ----- Substituting 5 for z in eq (vi)

x + 30 = 31

 



1 + y + 5 = 8 ------ Substituting 1 for x, and 5 for z in eq (i)

6 + y = 8

 

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