Calculator+Help


 * =Solving Systems by Graphing=


 * =Turning Diagnostics ON(see steps below)=

Don’t press the [ALPHA] key, because the CATALOGcommand has already put the calculator in alpha mode. Scroll down to DiagnosticOn and press [ ENTER] twice. || Scatterplots
 * Turn on diagnostics with the [DiagnosticOn] command. || [ 2nd 0 //makes// CATALOG] [x -1 ]

Cursor to each highlighted = sign or Plot number and press [ENTER] to deactivate. ||
 * Turn off other plots. || [Y=]
 * Enter the numbers in two statistics lists. || [STAT] [1] selects the list-edit screen.

Cursor onto the label L1 at top of first column, then [CLEAR] [ENTER] erases the list. Enter the x values.

Cursor onto the label L2 at top of second column, then [CLEAR] [ENTER] erases the list. Enter the y values. ||
 * Set up the scatter plot. || [ 2nd Y= //makes// STAT PLOT] [1] [ENTER] turns Plot 1 on. ||
 * || [▼] [ENTER] selects scatter plot. ||
 * || [▼] [ 2nd 1 //makes// L1] ties list 1 to the x axis. ||
 * || [▼] [ 2nd 2 //makes// L2] ties list 2 to the y axis. ||
 * Plot the points. || [[image:http://www.tc3.edu/instruct/sbrown/ti83/pic/regr_83a.gif width="200" height="136" caption="TI-83/84 scatter plot"]][ZOOM] [9] automatically adjusts the window frame to fit the data, but does not adjust the grid spacing.

(optional) The grid (if one appears) isn’t really doing you any good, and you may get horizontal or vertical lines that hide the data. To turn off the grid, press [ 2nd ZOOM //makes// FORMAT] [▼] [▼] [ENTER] [GRAPH].

If you prefer to keep the grid and adjust its spacing, press [WINDOW], set Xscl=1 and Yscl=5, then press [GRAPH] to redisplay the graph. (Appropriate values ofXscl and Yscl may be different for other problems. Pick the values that make the graph look best to you.) || || Linear Regression Model(in y 1 also) Making a prediction
 * Check your data entry by tracing the points. || [TRACE] shows you the first (x,y) pair, and then [►] shows you the others. They’re shown in the order you entered them, not necessarily from left to right.
 * Set up to calculate statistics. || [STAT] [►] [4] pastes LinReg(ax+b) to the home screen. ||
 * || [ 2nd 1 //makes// L1] [,] [ 2nd 2 //makes// L2] defines L1 as x values and L2 as y values. ||
 * Set up to store regression equation. || [,] [VARS] [►] [1] [1] pastes Y1 into the LinRegcommand. ||
 * Make it so! || [ENTER] shows correlation and regression statistics //and// pastes the regression equation into Y1. ||
 * Now you have stored in y= || 2nd GRAPH takes you to your prediction table. ||
 * || 2nd WINDOW will take you to the TABLE SETUP> ||
 * Find a specific x-value || Enter in your x-value for the TblStart= ||
 * || 2nd  GRAPH takes you back to the table. Scroll over to y column and you have your prediction y-value. ||