An **equation grapher** is a **graphing calculator** that draws the graph of any **equation** of the form **G(x,y) = F(x,y)** where each side is an expression that can contain x and y.

An **equation grapher** is a more general graphing tool than a *function grapher*, which only draws the graph of *equations* in the form y = **f(x)** where the right hand side is an expression in x only.

An **equation graphing calculator** can also be used to graph **implicitly defined functions**.

To **graph equations** the *equal sign* must be used to enter both sides of the equation. This allows you to graph, for example, equations of lines in **point-slope** forms, equations of **conic sections** (**circles**, **parabolas**, **hyperbolas** and **ellipses**) and **level curves** as well as **implicit functions**.

**pi**is replaced by**π**.

*You can use your mouse to Rotate Axis, Translate and Change Scale*

In addition to inputting data — by first pressing the *gear* button — you can use your mouse to perform some functionality unique to this **interactive polar grapher** as outlined below.

- Click on (or near) an axis and move your mouse. That will
**rotate the axis**. The graph(s) are re-drawn in the*generalized*polar coordinate system. Click again to release the axis. - Drag the mouse to
**move the coordinate system**together with the graphs. - Double-click in the canvas to
**move the origin**to where was clicked. - Hold down Alt key and click on an axis to
**change the scale (zoom in one direction)**; the point which was clicked will be labelled "1" (or "-1") and becomes the new unit for that axis.

**Lines**

**Circles**

**Ellipses**

**Parabolas**

**Hyperbolas**

**Other graphs**

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To copy or save graphs right click on the image of a saved graph below and select "Copy image" or "Save image" from the pop-up menu.