Algebra I                              Graphing Calculator Instructions                                               Algebra home page

 

 

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.

 

Some helpful instructions:

 

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

 

 


                                                                    Y1 = 2x2 – x

 

                                                                     Y2 = 3

 

                                                                 The solutions are x = -1 & x = 1.5

                                                                (where the graphs intersect).

 

 

 

 

 

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)

 

 

 

 

 

 

 

 

 

 

 

 


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 your calculator

 

     *  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