- Enter a function of
*x*in the input box*f(x)*. - Set the domain of the function by dragging the endpoints of the blue line at the bottom of the window.
- Click on the “Horizontal Line Test” and drag the vertical slider. Is
*f(x)*a one-to-one function? - Click on the “Reflect
*f(x)*” button. - Drag the horizontal slider to run the Vertical Line Test. Is the reflection a graph of a function?
- Drag the endpoints of the blue segment under the graphs to restrict the domain of
*f(x)*in such a way that the reflected graph is a graph of a function. - Hide all points created by the horizontal and vertical line tests by clicking the respective checkboxes.
- Click the “Show Corresponding Points”. Drag the orange point along the graph of
*f(x)*and notice its reflection on the graph of the inverse function.

Irina Boyadzhiev, 25 September 2013, Created with GeoGebra

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