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Calculator Information
For all prep math classes any scientific calculator will be acceptable.
TI-83 or TI-83 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 TI-83 or TI-83 Plus.
TI-83 Plus or TI-84 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 x-axis.
Window
ymin & ymax
Sets lowest (bottom) and highest (top) value of the y-axis.
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
x-value
Enter
Put marker on dotted line and enter all your x-values.
L2
y-value
Enter
Put marker on dotted line and enter all your y-values.
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 y-intercept (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.
Put in calculator for graphing as: (5x + 7) / (2x – 3)