"Where do the equations y=x and y=-2x+3 intersect?"One way to find the solution is to solve the two equations algebraically using simultaneous equations.
First open and clear the main work pane.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjvO8w3oLK9JD9_ms2wNMg8i5cKlpLPGvWc4dCAf41rmVBbMOhsGUEWQ9-vqFfzg1nD3ej7hMJIHYLReH4QgM1wyOCU-hw71j6hfG5k6lN-cbL3dzdaAzajjV8BGeKcvbizEFqp6RBDlog/s400/1_main+application+blank.png)
Press the blue Keyboard button and bring up the soft keyboard. Select the 2D tab.
You should be able to see a button with a bracket and two small boxes (circled below in red). Press it.
You should see the simultaneous equation template in the main pane.
(Update 1/6/2010: Press it twice to add a third equation line!)
Click on the box below it and type y=-2x+3
In the third box to the right of the vertical line type x,y (the variables we wish to solve).
Hit the exe button.
The answer (x=1, y=1) should appear.
Here is a link to other CAS calculator posts.