Question about Texas Instruments TI-84 Plus Silver Edition Graphic Calculator

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How to you change Y1 great than or equal to, to =

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If you are running the Inequalz application, you can access the menu tabs at the bottom of screen by pressing the [ALPHA] key. Thus pressing [ALPHA] [Y=] in [Y=] editor puts an [=] sign after the Y-variable.

Posted on Oct 16, 2010

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Need help with rate of change and direct variation


No need for a claculator to understand these concepts.
A linear function is a function of the form y=ax+b. It contains an independent variable,x, a dependent variable, y, and two constants, a and b,
The value of the constant a is the measure of the rate of change of the function, The value of the constant b is the ordinate (value along the y-axis) where the straight line cuts the y-axis. It is called the y-intercept, or the initial value.
If the value of b=0, the straight line passes through the origin O(0,0). The purists call this type of variation, a direct variation. If b is not equal to 0, it is called a partial variation or some other name.

If you have the graph drawn, b is read off the y-axis: You look at the graph and try to estimate the ordinate of the point where the line cuts (intersects) the y-axis.
To get the rate of change a, you select two points on the line. Let 1st point have coordinates (x1,y1) and the 2nd point have coordinates (x2,y2).
The rate of change is given by the ratio (y2-y1)/(x2-x1). You can also use a= (y1-y2)/(x1-x2). Respect the order in the two expression or you will get the negative value of the rate of change.

May 10, 2011 | Texas Instruments TI-83 Plus Calculator

1 Answer

Every time that I put in a function such as Y1=(square root symbol)100-x^2) Y2= -Y1 and both functions are highlighted at the equal signs, but after I hit trace it will only do Y1. I have experimented and...


Hello,
You can draw several graphs on the same screen and use the TRACE function to move the cursor along a curve and read the values of the x-y coordinates. To move cursor along the same curve you use the left and right arrow keys.
But to jump from one curve to another curve, you use the Up and down arrows. Each time you press the Up or down arrow cursor jumps from the current curve being traced to the next one as they were entered in Y= editor.

Nov 09, 2010 | Texas Instruments TI-84 Plus Calculator

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When i did y= and put in -x+3 for Y1 and (x-1) divided by -3 and hit graph, it says ERR:SYNTAX please help. im trying to solve linear systems by graphing.


Try rewriting your equations in the equivalent forms that follow.
Y1=3-X
Y2=(1-X)/3

If you do not get a syntax error it means that you were not using the correct minus sign.
If the - is the first symbol after the equal sign you must use negation (-) or change sign key.
Similarly, after the division / key you must use the negation or change sign (-)

Oct 07, 2010 | Texas Instruments TI-84 Plus Silver...

1 Answer

On my Y= menu, Y1 has a greater than or equal to sign instead of = also, at the bottom of my screen an equals sign, a less than or equal to, a greater than, and a greater than or equal to, are lined up


Hi,
You are running the application called Inequalz. You must uninstall it (NOT DELETE) to return to the normal calculator configuration.
Press [APPS]. Scroll down to find Inequalz. Highlight its number in the list and press {ENTER]. You will see a screen Inequal Running and
  1. Continue
  2. Quit Inequal
  3. 3:About.
Press [2:Quit ..]
Your calculator will unload it out of memory.

Hope it helps.

Dec 04, 2009 | Texas Instruments TI-84 Plus Silver...

1 Answer

Trying to graph polynomial equation and err:invalid dim comes up


Hello,
Before starting to graph Y= function, you should Turn STATPLOTS off.
Press [2nd][STATPLOTS] [4:PlotsOff]. command echoes ob screen as PlotsOff . Press [ENTER] to execute it. Calc answers Done.
Press [MODE]
See if Func, (4th line) is already highlighted.
If it is press Y= to start entering the functions.
If it is not highlighted, scroll down to 4th line, then use arrow to highlight Func an press ENTER.

Then press Y= and enter the function. You see that as you enter the function the equal sign becomes highlighted white on dark. Finish entering the sunction and press ENTER. Cursor move to Y=2. Make sure that the equal sign for Y1= is still highlighted. If not, move the cursor on it and press [ENTER].

You can enter the variable X by pressing the [X,T,theta,,n] button to the right of the green [ALPHA] key. Or, alternatively, you press [ALPHA] [STO->] (X).

To graph Press [GRAPH]. If you do not see anything on screen, it may be due to the window dimensions. You can modify the window by pressing the [WINDOW] button.

To test you configuration, I suggest you graph Y1=e^(x) and Y2= ln(x)
e9fbf22.jpg

You access the exponential e by [2ND] [LN] (e^x) and the natural log by pressing [LN]. In each case you have to enter the right parenthesis.
This what you should get.
d4c87a8.jpg
If you are not familiar with these function, just enter Y1=X and you will see a staright line passing through the origin (0, 0), just like the one on the following screen capture.


2aeab91.jpg
Hope it helps.

Oct 17, 2009 | Texas Instruments TI-83 Plus Calculator

1 Answer

Trying to use graph function but nothing comes up on screen


Hello,
Before starting to graph Y= function, you should Turn STATPLOTS off.
Press [2nd][STATPLOTS] [4:PlotsOff]. command echoes ob screen as PlotsOff . Press [ENTER] to execute it. Calc answers Done.
Press [MODE]
See if Func, (4th line) is already highlighted.
If it is press Y= to start entering the functions.
If it is not highlighted, scroll down to 4th line, then use arrow to highlight Func an press ENTER.

Then press Y= and enter the function. You see that as you enter the function the equal sign becomes highlighted white on dark. Finish entering the sunction and press ENTER. Cursor move to Y=2. Make sure that the equal sign for Y1= is still highlighted. If not, move the cursor on it and press [ENTER].

You can enter the variable X by pressing the [X,T,theta,,n] button to the right of the green [ALPHA] key. Or, alternatively, you press [ALPHA] [STO->] (X).

To graph Press [GRAPH]. If you do not see anything on screen, it may be due to the window dimensions. You can modify the window by pressing the [WINDOW] button.

To test you configuration, I suggest you graph Y1=e^(x) and Y2= ln(x)
e9fbf22.jpg

You access the exponential e by [2ND] [LN] (e^x) and the natural log by pressing [LN]. In each case you have to enter the right parenthesis.
This what you should get.
d4c87a8.jpg
If you are not familiar with these function, just enter Y1=X and you will see a staright line passing through the origin (0, 0), just like the one on the following screen capture.


2aeab91.jpg
Hope it helps.

Oct 14, 2009 | Texas Instruments TI-83 Plus Calculator

1 Answer

The calculator only allows one line equation to show up at a time. There are also arrows where a division mark should be by the Y1, Y2, etc.


Hello,
Clear the you the RAM to revert to default settings and restart. I am including screen capture fro a TI to show you how to set up the calculator.

d4c969a.jpg

Notice the white-on-black equal signs. For a function to be drawn, the equal sign in its definition must be highlighted. To effect that you scroll left to the = and press ENTER. You will know the function has been selected for graphing if its equal sign remains white-on-black after cursor has moved to another location.

cb0d5d6.jpg
Here is what the 4 functions look like. They all are on same graph.
Now we will change the graph style of the cosine function.

fce7a77.jpg
The only difference between the first screen and this one is the style of the line at the left of the Y4. To change the style, you move to the cursor to the left of the Y and press ENTER. Each time you press êNTER, the style for the function in question changes. Here is the product.
00e0856.jpg
The wavy curve (cosine) is now dotted.

Hope it helps.

Oct 05, 2009 | Texas Instruments TI-84 Plus Calculator

1 Answer

I can't find how to graph absolute value function.


Hello,
Here how you do it taking as exemples y1=x^3 -5 and y2=abs(x^3-5)
Turn calculator ON by pressing [AC/On] . Use arrows to select [Graph] icon and press [EXE]
On line Y1= enter X[^]3 -5 [EXE]
On line Y2= press [OPTN] [F5:NUM][F1:abs] [(] X [^]3 -5 [)] [EXE]
The graphs will be drawn one after the other. You might have to adjust the window limits.
Here is an ouput drawn on another calculator.
09b72b9.jpg
For negative values of the x-variable, Y1 has negative values, while in the same range, Y2 has positive values, equal and opposite to those of Y1. In that range, Y1 and Y2 are symetric of each other with respect to the X axis.
For positive values of the x-variable, Y1 and Y2 are identical.

Hope it helps

Jan 30, 2009 | Casio CFX-9850G Plus Calculator

1 Answer

Y1 W1 Wire from older Honeywell to new RTH honeywell


Y1 means for cool and W1 means for heat. Connect accordingly.

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1 Answer

Entering y1 in program mode


First, you cant put Y in Y(X)


Hit [2nd] [ALPHA] [0] [1]

Jun 25, 2008 | Texas Instruments TI-85 Calculator

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