8-8 DRAW Instructions
8308DRAW.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 12:29 PM Printed: 02/19/01 1:49
PM Page 8 of 20
To draw a tangent line when a graph is displayed, follow
these steps.
1. Select 5:Tangent( from the DRAW menu.
2. Press † and } to move the cursor to the function for
which you want to draw the tangent line. The current
graph’s Y= function is displayed in the top-left corner, if
ExprOn is selected.
3. Press ~ and | or enter a number to select the point on
the function at which you want to draw the tangent line.
4. Press Í. In Func mode, the X value at which the
tangent line was drawn is displayed on the bottom of
the screen, along with the equation of the tangent line.
In all other modes, the dy/dx value is displayed.
Tip: Change the fixed decimal setting on the mode screen if you want
to see fewer digits displayed for X and the equation for Y.
Tangent( (tangent line) draws a line tangent to expression
in terms of X, such as Y1 or X2, at point X=value. X can be
an expression. expression is interpreted as being in Func
mode.
Tangent(expression,value)
Drawing Tangent Lines
Drawing
a Tangent Line
Directly
on a Graph
Drawing
a Tangent Line
from the Home
Screen or
a Program