Two online calculators and solvers for systems of 2 by 2 and 3 by 3 linear equations.
2 by 2 systems of linear equations are of the form
a x + b y = c
d x + e y = f
The calculator uses Cramer's rule
x = (c e  f b) / D and y = (a f  d c) / D
to solve the system.
D is the coefficient determinant given by D = a e  b d.
How to use the calculator
1  Enter 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.
Below is a 3 by 3 system of linear equations solver where the system is of the form
a x + b y + c z = k
d x + e y + f z = l
g x + h y + i z = m
More Math Calculators and Solvers.
More references on solving systems of linear equations
Solve Systems of Equations  Tutorial.
Cramer's Rule to Solve Systems of Equations.
