Question

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

Answer 1

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.