Two online calculators and solvers for systems of 2 by 2 and 3 by 3 linear equations using Cramer's rule and showing the steps.
Review Cramer's Rules
The solutions of a systems of a 2 linear equations with two varibles x and y of the form
are given by Cramer's rule as follows
\[ x = \dfrac{D_x}{D} , y = \dfrac{D_y}{D} \]
where the determinant of a 2 by 2 Matrix, \( D \), \( D_x \) and \( D_y \) are defined by
Use the Systems of Equations Solver and Calculator to Solve 2 by 2 Syatems of Equations
Enter the coefficients \( a_1, b_1, c_1, a_2, b_2 \text{ and } c2 \) as defined in the system above and the number of decimal places in the results as decimals and press "Solve System" to obtain the answer, the values of the different determinant and all steps included in the calculations.
This tool can be used to check the solutions of a 2 by 2 system of equations solved by hand. It can also be used, efficiently, to explore 2 by 2 system of equations using different values for the coefficients.
Steps
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Systems of Equations Solver and Calculator to Solve 3 by 3 Systems of Equations
Below is a 3 by 3 system of linear equations solver where the system is of the form
\[
\left\{
\begin{array}{lcl}
a_1 x + b_1 y + c_1 z = & \color{red}{d_1}\\
a_2 x + b_2 y + c_2 = & \color{red}{d_2} \\
a_3 x + b_3 y + c_3 = & \color{red}{d_3} \\
\end{array}
\right.
\]
and the solutions are given by
\[ x = \dfrac{D_x}{D} , y = \dfrac{D_y}{D} , z = \dfrac{D_z}{D} \]
for \( D \ne 0 \)
and
where \( D, D_x, D_y \text{and} D_z \)
are determinants of 3 by 3 matrices defined by
are given by Cramer's rule as follows
