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TI- 83 ,84 GRAPHING CALCULATOR STEP BY STEP OF HOW TO USE TO FIND SLOPE OF LINES GRAPHING CALCULATOR
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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.

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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

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.

 

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