Solution:
The given eq. are
Substituting and in equation(i) and equation(ii), we obtain
..(iii)
On multiplying equation(iii) by 3 and subtracting it from equation(iv), we obtain
Now, substituting in equation(iii), we obtain
Adding equation(v) and equation(vi), we obtain
Substituting in equation(vi), we get
As a result, and