Dynamically explore with a variety of online tools. Graphical models were made using Desmos, which works best with Chrome, Firefox and Safari but only some versions of Internet Explorer.
Solving Systems of Equations
Edit the equations in Desmos. The intersection points correspond to the solutions.
Functions are graphed with Desmos. You can modify parameters by editing them, using the sliders or by "playing" the animation and see the resulting change(s) in the graph.