Here is where you enter formulas when you want to see a graph or a table of values.
What you see on the Y= screen depends on your Graph Mode, but all formats are pretty much the same.

To enter or edit a formula, move the cursor to the line you want and push ENTER. (You can also edit a formula by highlighting it and pushing F3.)
Formula entry takes place on the command line; you can see that the command line above has y2(x)= waiting for input.

To erase a formula, highlight it and push CLEAR.

If you scroll up above the functions, you'll see various plots you may have defined in the Data/Matrix editor. Unchecking or deleting these plots can sometimes eliminate some error messages.

The Tools menu has the usual entries, including the same Graph Format menu as the GRAPH screen. F1,8 will clear the Y= screen. You can remove individual entries by highlighting them and pushing the CLEAR button (near the cursor controls.)

The Zoom menu is the same as the one on the GRAPH screen. Using it takes you directly to the GRAPH screen.

F4 adds or removes a checkmark in front of the highlighted formula. Only checked functions will graph.
(NewProb unchecks all the functions on the Y= screen, but doesn't erase them.)

The All menu lets you perform various actions on all the functions at once.

The Style menu determines how the graph of each function is drawn.
(Selections apply only to the highlighted function. Not all the styles are available in different Graph Modes.)

• Line is the default style. Each plotted point is a single pixel, and the calculator connects the dots.
• Dot plots occasional pixels. It doesn't connect the dots. Graphs in this style are hard to see.
• Square puts a square (3 pixels on a side) around each plotted point. It doesn't connect the dots. It works best for data plots or functions with discontinuities.
• Thick draws a thicker line than Line.
• Animate shows a flashing cursor tracing out the curve. When it's finished, the curve isn't visible.
• Path shows a flashing cursor tracing out the curve. When it's finished, the curve looks like Line style. This is particularly useful in PARAMETRIC or POLAR mode, where it's possible for a graph to cross over itself.
• Above and below add shading above and below the graph.

In 3D mode, you may only check one function definition at a time.

In SEQUENCE and DIFF EQUATIONS modes, you have the option of supplying initial information. For sequences, you might define each term to be twice the preceding one, and you'll have to tell the calculator what the first term is. A given differential equation will probably have infinitely many different solutions, so you'll have to tell the calculator one point on the graph of the solution you want. Otherwise, the Y= screens look much like the one for FUNCTION mode.

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