Assume there are two linear equations:
$a_1 x + b_1 y +c_1=0$
$a_2 x + b_2 y +c_2=0$

The solution is $x=\frac{b1*c2-c1*b2}{a1*b2-a2*b1}$, $y=\frac{a2*c1-a1*c2}{a1*b2-a2*b1}$

You can drag the [b]circle[/b] to change the slope of the linear equation or drag the square to change the offset of the linear equations.

There is a similar applet: [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1048.0]Solving linear equations[/url]

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