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

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ERR: No Sign change...

I am trying to find the intersection of -0.171x-+43.43 and -0.146x+39.83. I entered them into my "y=" and clicked graph. I then plug in "2nd trace, and click on intersect" But i get a message saying "NO SIGN CHANGE" Whats going on here??

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-0.171x+43.43 and -0.146x+39.83
i tried that and i got the same thing, but i noticed that if you change your window so it fits more of the graph on the right, were you can actually see the lines intersect, then you can get the intersection.
oh, and by the way, the intersection is (144, 18.806)

Posted on Mar 01, 2009

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When I try to enter a simple equation and graph it, I get error 07 message instead of graph.

Error 07 Syntax
Means you made a typing error while entering the equation. Using the minus sign instead of the negation sign (change sign) (-), can produce a syntax error. Maybe you need to explicitly type the multiplication sign
y= (-) 1.5*x +3
Try entering it as 3 - 1.5*x

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Jun 11, 2014 | Texas Instruments TI-86 Calculator

1 Answer

Why does it ask if you want to guess when graphing

Here you are trying to find the intersection point between two curves. Since you could have drawn more than 2 curves, the calculator gives you the opportunity to choose the first curve using the arrow Up/ arrow down to select.

Once the curves are chosen, the calculator wants to know where (in the world is Carmen Sandiego) is the intersection point. And no it is not asking you to give the position, just what are the leftmost (1st guess) and rightmost (2nd guess) limits of the interval where the intersection point is. You use the left arrow to go a bit to the left of the intersection point (which you see on the graph) and press ENTER. Then you do the same for the 2nd guess.

Dec 03, 2013 | Texas Instruments TI-83 Plus Calculator

2 Answers

Log(x+2)+log(x+3)=7-x How to intersect with TI-84

Press Y=
On the Y1 line enter the expression LOG(X+2)+LOG(X+3) by pressing
LOG ALPHA [X] ) + LOG ALPHA [X] + 3 )
On the Y2 line enter the expression 7-X by pressing
7 - ALPHA [X]
Press GRAPH to see the graph. To see where they intersect, press 2ND [CALC] 5. See "First curve?" in the lower left. Use up/down-arrow to select one of the two curves and press ENTER. See "Second curve?" in the lower left. Use up/down-arrow to select the other curve and press ENTER. See "Guess?" in the lower left. Press ENTER. The calculator will show the coordinates of the intersection.

Sep 19, 2012 | Texas Instruments TI-84 Plus Calculator

1 Answer

When I graph system of linear equations and try to find an intersection point it says no sign change why?

The solve( function was not able to find the intersection point because it lies outside the graph range. The window dimensions are too narrow to contain that point. I suggest you restrict the graph to the quadrant where you suspect the solution to be (example first quadrant if appropriate) : take Xmin=0, Ymin =0 and choose Xmax and Ymax large enough to enclose the intersection point.

Sep 11, 2011 | Texas Instruments TI-84 Plus Silver...

1 Answer

How do you find the point intersection of ln x=-7x

Graph both lnx and -7x and then go to the graph. Once there, press 2nd then calc and scroll down to where it says "Intersect", select that, select a point on each line, and press enter and it should give you the intersection point.

Mar 25, 2011 | Texas Instruments TI-84 Plus Silver...

1 Answer

My calculator only graphs one of my functions at a time and I need it to do all of them at once so I can calculate intersections and such. I have the TI-84 Plus. Thanks!

The following should help draw several graphs.
When you enter a function you should press [ENTER] to validate. At the same time, the cursor moves to the next line. Verify that the = sign on the equation already entered is still highlighted.
If for some reason the = sign of an equation is no longer highlighted, use arrow keys to move cursor on the = sign and press [ENTER].

If only one = sign remains highlighted and all others are not, then in all probability the application Transfrm has been executed before and is still lingering in RAM. When in RAM, it takes over the graphing capabilities of the native OS. This prevents you from drawing more than one graph.You must unload it from memory.
  1. Press the [APPS] key.
  2. Scroll down to the line that shows Transfrm.
  3. Highlight it and press [ENTER].
  4. In following screen you are invited to Uninstall or continue.
  5. Press the number to the left of Uninstall. Validate if need be.
  6. Return to the Y= editor to type in functions to graph.

Oct 17, 2010 | Texas Instruments TI-84 Plus Calculator

1 Answer

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.

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...

2 Answers

I am getting ERR:ARCHIVE 1:QUITE when I try to

I tried all possible situations where one would get an error ERR: ARCHIVED 1:QUIT 2:GOTO in relation to graphing, and I was unable to do so. Thus I cannot explain your error (in relation to graphing). I conclude that the error is unrelated to the graph.

As a general rule, one you get message ... 1:Quit, 2:GOTO press 2 and you will be shown the location where the offending symbol is.

Anyway, to graph functions, always deactivate the statistical plots
  1. Press [2nd][Y=] to access (STATPLOT) then press [4:PlotsOff]
  2. Command PlostOff echoes on main screen.
  3. Press [ENTER], calculator answers Done.
  4. Open the [Y=] editor to enter your function and
  5. Press [GRAPH].
  6. If you do not see any graph,
  • press [ZOOM][6:ZStandard] or
  • adjust the window dimensions by
  • pressing [Zoom] and
  • setting the Xmin,Xmax,Ymin,Ymax values
  • making sure that Xmin is less than Xmax, and Ymin is less than Ymax.

Feb 28, 2010 | Texas Instruments TI-83 Plus Calculator

1 Answer

Ti 84 plus problem

The calculator only displays from -10 to 10 on the x and y axes, and both of your lines are outside of that range. However, it is easy to change that.

1. Hit the gray "WINDOW" button that is directly under the screen
2. Change "Xmax" to 150
3. Change "Ymax" to 200

Remember to change both of those values back to 10 when you are done with this problem!

Here's how to graph it:
1. Hit the "Y=" button
2. Enter your first equation after Y1, and your second equation after Y2
3. Look over both the equations to make sure you typed them correctly
4. Hit the "GRAPH" button
5. If you don't see the intersection you will need to adjust Xmax and Ymax again
6. Hit Hit "2ND" and the "TRACE" to bring up the "CALC" menu
7. Scroll down to "intersect" and hit enter
8. Hit enter 3 times (You use the first and second curve options when you have more than 2 lines)
9. It should display the coordinates at the bottom
10. I got (76, 142.1) for the intersection

Thanks for asking this question! I used to do this a much harder way, but while I was calculating the answer to your question I hit a wrong button and accidentally found this method!

Jun 30, 2009 | Texas Instruments TI-84 Plus Calculator

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