How do I use Cramer's rule to solve a #2xx2# matrix?

1 Answer
Aug 29, 2014

Cramer's rule is used to solve a square system of linear equations, that is, a linear system with the same number of equations as variables. In a square system, you would have an #nxx(n+1)# matrix.

So you should have a #2xx3# matrix in order to use Cramer's rule. A #2xx2# matrix would only have the coefficients of the variables; you need to include the constants of the equations.