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