# Graphing Calculator Instructions

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```					               Graphing Calculator Instructions

Online Graphing Calculator: You can find an online graphing calculator
by googling “hrw online graphing calculator” (should be the first item) or
by going to the pomperaug home page & clicking departments, then math,
then hodge.

Graph Equation: Click Equation tab, enter formula after y = , click graph

Adjust Size or Window: Click Settings tab, enter values, click graph

Trace: Click Trace and use the arrows to move

Find an Intersection: First enter the two equations you want (y = 2x – 1 &
y = 3 for example). Click Intersection tab, click the
white boxes, click graph, and click find intersection.

Intersection Method: You can solve any equation by graphing the left side
and the right side separately & seeing where they intersect.

Ex: Use the intersection method to solve:        3 = 2x2 – x
y
4
y =2x^2 - x
Y1 = 2x2 – x
3
y= 3
Y2 = 3
2

1                           The solutions are x = -1 & x = 1.5
(where the graphs intersect).
x
-1            1   2    3      4
-1
TI-83Graphing Calculator:

Initialize: Y= , make sure plots are not shaded, & clear any formulas

Enter an equation: Y = and type equation (x key is near the top left)

Size of Graph: window (the graph below has xmin=-2, xmax=7, ymin=-3,
ymax=8)

8    ymax
7
6
5
4
3
2
xmin 1                           xmax

-2 -1-1     1    2   3   4   5   6   7
-2
ymin
-3

Get to an x-value: Trace (use arrows to move or type the x-value you
want to get to )

Get to a y-value: Graph a second equation: Y2 = 3 (for a y-value of 3), then
2nd calc intersection enter enter enter
Regression Instructions: Regression is like finding a line of best fit, but
you don’t necessarily have to use a linear equation. The graphing calculator
can take a set of points and find a line of best fit (or a parabola of best fit or
many other types equations).

* You can always use 2nd quit to get out of a screen or menu

* Initialize List Menu: stat setupeditor enter ;

* Set up Plot: 2nd y= 1 select scatter plot for the type & select on;

* Enter the values in the calculator: stat edit (x values in L1;
y values in L2)

* Check the Plot: Zoom Zoomstat

* Get an Equation: stat calc select type (linreg, etc.) & enter.enter

* Enter the Equation: y= and enter the equation the calculator gave you

* Check The Match: zoom zoomstat

* Turn the plot off: y= & un-highlight the plots

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