
Math Support at the Learning Support Center
Calculator Information
For all prep math classes, PreAlgebra (MAT0012) or Beginning Algebra (MAT0024), students can use any scientific calculator. For college level math classes, Intermediate Algebra (MAT1033) and beyond, students will need a graphing calculator, such as a Texas Instruments TI83 or TI83 Plus. Other calculators can be used, but instructors discuss and instruct using the TI83 or TI83 Plus.
User Guides
TI83 Plus or TI84 Graphing Calculator Hints
NOTE: 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. 
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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 
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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. 
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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. 
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