Cramer's Rule

Cramer's Rule is used for a system of linear equations that has as many equations as unknowns and is valid whenever the system has a unique solution. The main equations are x=DX/D and y=DY/D. The way the actual solving process is set up is you put only the coefficients of x and y then cross multiplying as you do in matrices in order to get an answer. Then for the second equation the x values would be replaced by the value of the sum and the same for the y too. The point of Cramer's Rule is to not need more than one variable in order to solve a system.