Given a system 
, a unique solution 
exists 
is invertible. This solution can be found using the following rule: 
where 
is the matrix 
with the 
th column replaced by the constant vector 
.
, a unique solution exists is invertible. This solution can be found using the following rule: is the matrix with the th column replaced by the constant vector . Excercise 5-2.
Solve the following system using Cramer's rule: 
