Question about Texas Instruments TI-84 Plus Calculator

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HELP!! i have a TI-84 plus and im trying to solve for linear equations on the calc. and when i go to the Y= button on the top left of the calc. and its y1..y2.... right before the Y1 its supposed to be a dash however i dont know how to change it from a triangle which it currently is on to a dash like its supposed to look like this ( /Y1 ) not >Y1 which it is currently at.. how do i fix it?

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Arrow to the left of the Y= until you have highlighted the triangle, and press enter until you see what you are looking for. The triangle you are referring to is probably to graph an inequality and I think you are looking for a regular line.

Posted on Feb 04, 2008


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I need to enter two columns of,values, x and y, to determine the linear equation but my table,only,displays the x column. How do,I get the y column back to enter numbers in?

Use the STAT function
Enter independent x_variable in L1, and y-variable in L2
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You can't simply enter 7x+9=30 into the calculator, there is a way to calculate what the x is but its been a few years since I've done these..

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How do i do systems of linear equations on my ti-84 plus

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Dec 09, 2011 | Texas Instruments TI-84 Plus Calculator

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After you enter the data draw the SCATTER plot first.
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From the Stat>CALC menu press LineReg
The command echoes on command line
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Press [,] to separate
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Press [,] the comma again
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Sep 13, 2011 | Texas Instruments TI-84 Plus Calculator

1 Answer


Assuming you want the solution graphically.
You press the Y= button (top left)
Enter the first side of the equation after Y1=
Press the down arrow
Enter the other side of the equation after Y2=
Set the setting by pressing the window button (set xmin to -10; xmax to 10; ymin to -10; ymax to 10 )
Press the graph button
You will see now the two functions potted.
Now press Calc ( 2nd and after that Trace)
Select the correspondant number for intersect.
Set min to -10
Press enter
Set max to 10
Press enter
Guess something between -10 and 10 (eg. 0)
The answer will come out quickly (x=-3,5)

Hope it helps.

Mar 15, 2011 | Texas Instruments TI-84 Plus Calculator

1 Answer

My graph won't "reset" itself, after I went to the left of the origin and now I can't see any other solved linear equations

You can move the cursor back to the center of the graph.
You can also press [ZOOM][6:ZStandard] and the graph will be centered on (0,0).

Mar 03, 2010 | Texas Instruments TI-84 Plus Silver...

1 Answer

I am trying to solve imaginary number equations with matrix using the TI-84 For example: (8+15i)x-8y = 10 -8x-(8-10i)y = 0 8+15i -8 10 -8 8-10i 0 should i convert to another form?

I am afraid you cannot use the TI8xPlus family of calculators to solve linear systems in matrix form. In this calculator, matrices must have real coefficients.
You can however separate (expand) the problem into a linear system of 4 equations in 4 unknowns and try to solve it with the calculator.
  1. define X = a+i*b
  2. Define Y=c+i*d
  3. Rewrite the first equation substituting a+i*b for X and c+i*d for y.
  4. Gather all real terms together, and all imaginary terms together on the left.
  5. You will have (8a-15b-8c) +i(15a+8b-8d) = 10 +0i
  6. This equation can be split into two equations by saying that
  • the real part pf the left member is equal to the real part of the right member, this gives 8a-15b-8c=10, and
  • the imaginary part of the left member is equal to the imaginary part of the right member, this gives 15a+8b-8d=0
Similarly, you rewrite the second complex equation substituting a+ib for X and c+id for Y, then expand the binomial products, gather the real parts on the left together, and the imaginary parts on the left together. After that you equate the real part on the left to the real part on the right, and do the same for the imaginary parts.

If I did not make mistakes during the expansions and the gathering of terms you should get the following equation
-(8a+8c+10d) +i*(-8b+10c-8d) =0+i*0 from which you extract an equation for the real parts, -(8a+8c+10d)=0 and another for the imaginagy parts i*(-8b+10c-8d) =i*0

If I did not make mistakes (you should be able to find them, if any) your system of two linear equations with complex coefficents has been converted to a system of 4 linear equations with real coefficients.

-8b+10c-8d =0

Now, you can in theory solve this system with help of the calculator, to find a, b, c, and d. When these are found, you can reconstruct the X and Y solutions.

Now get to work: Ascertain that my extracted equations are correct, then solve for a, b,c, and d, and reconstruct X and Y.
I am no seer, but my hunch is that this system is degenarate. I will not explain what that means.

Feb 10, 2010 | Texas Instruments TI-84 Plus Calculator

1 Answer

TI-84 Plus Linear Regression (ax+b) ERR:DIM MISMATCH

Some old configuration settings, or old variables are spoiling your fun. Clear the RAM and start again.
Hope it helps.

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1 Answer

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I just tried the TI83 to define a 45x45 square matrix and a 55x45 matrix. The maximum number of rows or columns is 99. But it will depend on memory.
If you have the TI84PLUS Silver Edition it should be fine. You can upgrade to a TI 89 Platinum, which can handle symbolic calculations (with undefined coefficients a, b, c).
Hope it helps.

Sep 17, 2009 | Texas Instruments TI-84 Plus Silver...

1 Answer

Could you help me

make sure your stat plots are off. you can just reset your calc. second + 7 1 2. or you can hit second y= and make sure that the stat plots are off. have any more questions. just send me a another request.

Jul 17, 2008 | Texas Instruments TI-84 Plus Silver...

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