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  Calculator Information For all prep math classes any scientific calculator will be acceptable. TI83 or TI83 Plus is recommended for all college level math classes. Note: Other calculators can be used, but instructors discuss and instruct using the format associated with the TI83 or TI83 Plus. TI83 Plus or TI84 Graphing Calculator Hints All highlighted text represents a calculator key! General information: Zoom  6: ZStandard  Two steps to make a graph go 10 units in every direction.  Left arrow  Right arrow  Used to move your cursor on the graphing screen.  Up arrow  Down arrow  Changes the equation that calculator is referring to.  y =   Allows you to put in an equation that is solved for 'y'.  x,T,Ø,n   Allows you to put the variable 'x' into an equation.  Trace  Left or Right arrow changes info  Finds mostly approximate decimal values for 'x' and 'y'.  Trace  Pick 'x' value  Gives matching 'y'. The 'x' value must be on graphing screen.  Trace  0 (zero)  Gives you the y  intercept.  Window  xmin & xmax  Sets lowest (left) and highest (right) value of the xaxis.  Window  ymin & ymax  Sets lowest (bottom) and highest (top) value of the yaxis.  Graph  Zoom  0:Zoomfit  Helps to find a graph that does not show on your screen.  TOP Parentheses: Put on all numerators and denominators that have 2 or more terms. Example: Put in calculator for graphing as: (5x + 7) / (2x – 3) How to find an exact ‘x’ value on a graph: You are given a ‘y’ value from your graph and asked to find the matching 'x' value. y =  y2 =  Enter given 'y' value into the equation.  2nd  Trace  5: intersect  First curve? Enter Second curve? Enter Guess? Enter If there are 2 or more intersections, just before you guess use your left or right arrow to put cursor on the intersection that you want information on.  Calculate  TOP Calculations: 2nd Trace 2: zero  Finds the 'x' intercept.  Left Bound? Place cursor to the left of point you are looking for on the graph. Enter Right Bound? Place cursor to the right of point you are looking for on the graph. Enter Guess? Enter  3: minimum  Finds vertex of parabola facing up.  4: maximum  Finds vertex of parabola facing down.  5: intersection  Finds intersection of 2 graphs.  First curve? Enter Second curve? Enter Guess? Enter If there are 2 or more intersections, just before you guess use your left or right arrow to put cursor on the intersection that you want information on.  TOP How to find a line of Linear Regression: What you are finding is a line that best fits (goes as close as possible) to all of the points that you scattered about your graph (scatterplot). Entering Data: Stat   Section that will allow you to enter your scatter plot points.  1: Edit  Enter  Allows you to erase, change, or add point information.  L1  Clear  Enter  Clears all L1 entries (Use arrows keys to put marker on L1).  L2  Clear  Enter  Clears all L2 entries (Use arrows keys to put marker on L2).  L1  xvalue  Enter  Put marker on dotted line and enter all your xvalues.  L2  yvalue  Enter  Put marker on dotted line and enter all your yvalues.  Note: You can change any value by highlighting the incorrect value and typing in new value. Enter  Calculating equation: Stat   Section that will allow you to calculate your equation.  CALC  Right arrow  Highlights the CALCulation section.  4  4: LinReg(ax+b)  Calculates the slope (a) and the yintercept (b) of your linear equation.  Note: The calculator may also display values of r2 and r which is used by some instructors.  Graphing equation: y =  y1 =  Will put your equation into any 'y' that you put your cursor on.  VARS  5  5: Statistics  Will move you to next screen for finding your equation.  EQ  Right arrow twice  This will show a screen with a list that includes 1: RegEQ  1: RegEQ  Enter  Returns you to the y= screen showing your equation.  GRAPH  Adjust window  Your now have your equation on the screen.  Note: The following steps will include all your scatterplot points on with your graph.  y =  Up arrow  Plot1 should now be highlighted and flashing.  Enter   The Plot1 colors should reverse themselves which turns on the Plot1.  GRAPH   Your graph should now include boxes that represent your points.  Note: Leaving the Plot1 when doing other work will often give you an error message.  TOP    
 
