V. DRAW Menu

A. Tangent

In algebra and calculus, you will often need to find an equation of a tangent line to a curve at a particular point. The TI-83 will draw a tangent line and will give a good approximation of the equation of the tangent line.

Example: Find an equation of the tangent line to the function shown below at X=2.

Enter the
function. |
Set a window.
Use ZDecimal. |
Graph with |

Access tangent.
Use DRAW 5. |
Enter a value
of X. |
Press ENTER.
Tangent will be drawn. |

To delete the tangent line, enter 1.