Two online calculators and solvers for systems of 2 by 2 and 3 by 3 linear equations.

How to use the calculator2 by 2 Systems of EquationsEnter the coefficients a, b, c, d, e, f and the number of decimal places in the results as real number and press "enter".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.
3 by 3 Systems of EquationsBelow is a 3 by 3 system of linear equations solver where the system is of the formd x + e y + f z = l g x + h y + i z = m
More References and linksMaths Calculators and Solvers.Solve Systems of Equations  Tutorial. Cramer's Rule to Solve Systems of Equations. 