## Getting Started with Sliders

Any time you have free variables in an expression, the calculator will offer to let you define them with sliders. You will see the option to add sliders appear in the expression bar once you finish typing in your equation. (Desmos has define *e* as constant and therefore cannot be used as a slider variable.)

You can also use the same variables in several expressions to plot curves that will change together. In this example, the value of c defines two parallel lines that move up and down together. In this example, the two lines stay perpendicular to each other for any value of m.

### Slider Limits, Intervals and Animation Speed

To adjust the limits and interval of your slider, click either of the values at the ends of the slider bar. Input your values and your graph will be automatically updated.

#### Adjusting the Animation:

- Loop forward and backwards
- Repeat in one direction
- Play once
- Play indefinitely
- Increase and decrease the speed

### Dynamic Bounds

You can use dynamic bounds to ensure a slider value stays between two other slider values. Check out this example exploring the Mean Value Theorem.

## Movable Points

You can change a static point to a movable point by clicking and long-holding the icon next to the expression list. A style editor will pop up with different drag options.