Cool Math
Coolmath: Determinants and Cramer's Rule for 2x2 Systems
Study this tutorial to find out how to use determinants and Cramer's rule to solve 2x2 systems.
Cool Math
Coolmath: Solving Equations Exercises: Ax+b = C (With Decimals)
Click on the 'Give me a problem!' button for an equation. Solve for x in the equation using pencil and paper, then check the answer. This is an example equation: 10x - 486.6 = -9. The solution is given as a fraction.