V. Zabrocki
08/26/02
Finding Intercepts with the TI-86
Intercepts are the points where a graph crosses either the x or y axis. So either the x
coordinate or the y coordinate will be 0. If you want the x-intercept, y will be zero. If you
want the y-intercept, let x equal 0.
Before you begin, clear all previously stored functions
Graph
F1: Y=
F4: DelF
Enter
If any Plots have been stored, unselect them.
Arrow up and/or over to highlight the Plot
F5: Select
Start by setting the viewing window
Graph
F3: Zoom
F4: ZStd
Enter an equation.
F1: Y=
yx12 1=+
Exit
F5: Graph
To find the x-intercept (y=0)
(The x-intercept is also referred to as the root or zero of the equation)
More
F1: Math
F1: Root
Left Bound?: - move cursor to the left of the x intercept using the left or right cursor
arrows
Enter
Right Bound?: - move cursor to the right of the x intercept using the right arrow
Enter
Guess?: Move cursor close to the x-intercept.
Enter
