These are questions that students in classes that
use the TI-86 often ask. If you are having a particular difficulty, it is likely
the answer to your question is in the list below. Links to particular sections
are included to help you find the answer you need.

### 1. My graph doesn't look right.
Why not?

When a graph doesn't "look right" it
is most likely because you have either entered
the function incorrectly or you have not set
the window properly.

### 2. The graph is not showing on
the screen. What's wrong?

There are two main reasons that a graph may not
show up.

a) The function may be turned
off. Make sure that the equal sign is dark. If not, then move the cursor
to the equal sign and press enter to turn the function on.

b) Your window
may not be set correctly.

### 3. The graph has no axes. How do
I turn them on?

The axes can be turned on and off with the FORMAT
menu.

### 4. Why am I getting the message
ERR0R 12: DIM MISMATCH?

This message is shown when you have a statistical
plot turned on and there are no values in lists
to graph or they are not evenly matched. You need to turn the plot off.

### 5. Why does my trace have different
coordinates?

The FORMAT
setting will determine whether rectangular or polar coordinates are shown.

### 6. When I try to graph a function
the screen has r1 or x1t and y1t on it instead of y1. How do I get a y1?

The MODE
setting will determine the type of graph that can be drawn.

### 7. Why can't I enter the values
I want to in the TABLE?

The TABLE
must be set to ASK before you can enter the values you want.

### 8. Can I solve an equation or check
an equation using a graph?

You can solve an equation if you can enter both
sides of the equation into the graph editor and use intersect
to find the solution.

### 9. How can I check an answer to
an equation on the Home Screen?

You can store
the answer in the variable X and then enter the expression to check your answer.

### 10. How can I edit a line without
having to retype the entire expression?

You can use the storage
area ENTRY to recall several recent entries.

### 11. I'm entering an expression
in the home screen but the answer is wrong. How can I correct this entry?

There is a good chance that your expression has
not been entered with the proper placement of parentheses. You must enter
parentheses to maintain the proper order of operations.

### 12. How can I make the screen darker
or lighter?

Use the cursor and the
key to lighten
or darken a screen.

### 13. I can't remember where a function
is. What do I do?

The CATALOG
menu has every function, variable, list, etc. in the catalog. You may want
to enter frequently used functions in the CUSTOM
menu.