3x3 CRAMER'S RULE CALCULATOR. The calculator given in this section can be used to solve the system of linear equations with three unknowns using Cramer's rule or determinant method. x + y + z =. x + y + z =. x + y + z =.
First of all, we construct matrix A with the coefficients of the unknowns: Now we apply the Cramer’s rule to solve the system of equations. To do this, we first have to find the determinant of matrix A: To calculate the unknown x with Cramer’s