Cramer’s Rule

For a given a system of linear equations, Cramer’s Rule is a handy way to solve for just one of the variables without having to solve the whole system of equations. They don’t usually teach Cramer’s Rule this way, but this is supposed to be the point of the Rule: instead of solving the entire system of equations, you can use Cramer’s to solve for just one single variable.

The point of Cramer’s Rule is that you don’t have to solve the whole system to get the one value you need.  Don’t let all the subscripts and stuff confuse you; the Rule is really pretty simple. You just pick the variable you want to solve for, replace that variable’s column of values in the coefficient determinant with the answer-column’s values, evaluate that determinant, and divide by the coefficient determinant.

Download Example here>> Cramers rule