From the graph screen, press DRAW (located above the PRGM key) to access the draw menu.
Press to select **5:Tangent(**. Enter the x-value at which you want the tangent line.
To find the tangent line to the curve at X = 1, press . The indicated point is marked, the
tangent
line is drawn,
and its equation is displayed.

From the graph screen we can find and draw the equation of a tangent line at a specified point on the graph of a function. For illustration, we find the tangent line to the function.
at x = 1. First, enter the function into the Y= editor, press
to access the zoom menu, then press to select |

Here, the equation of the tangent line to at x = 1 is y = -.6x + 4.4.