How do i solve a matric problem with a TI- 83+

Shift [x^-1] allows you to access the matrix features. Under Names you select the names you want to use for your matrices. Under Math you access the various commands. Under Edit you edit the contents of your matrices.

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..

You have a dimension mismatch if (for example) you are doing 2-var stats and the two lists do not have the same length. You can also have mismatch with matrices.

I am sorry you, will have to ask a direct question. You will be able to focus your question after you read the chapter on matrices. I have no idea how much you know about matrices. I would not know where to start. As Euclides said to King Ptolemy of Egypt, there is no royal road to geometry (mathematics).

This calculator does not support matrix equations/operations. You can either purchase a more expensive calculator with matrix functions, or you can do it by hand. Here is a basic tutorial on matrices: http://www.miislita.com/information-retrieval-tutorial/matrix-tutorial-2-matrix-operations.html
The TI-83 Plus is a calculator which will do matrix manipulation and is easily found used on sites like eBay.

If you got the message while trying to draw a graph

1. Press [2nd][Y=] (STAT PLOT)
2. Choose option [4:PlotsOff][ENTER]. Screen displays Done

If message popped up while doing something else that involves lists or matrices, the length of lists may be different, or the dimensions of matrices may not be compatible.

To Clear the lists:

1. Press [2nd][0] (CATALOG)
2. Press [PGRM] (C) to jump to first command that starts with c.
3. Use arrow to scroll down to ClrAllLists, select it [ENTER]
   
4. Calculator displays Done
5. Start the new problem.

To reset the Ram press [2nd][+] (MEM) [7:Reset][1:All Ram][2:Reset]. Press [CLEAR] to erase the Ram Cleared message.

When the RAM is cleared, the calculator is reset. The calculator resets itself after a battery change.

Imagine you are doing statistical calculations with two list, say L1 and L2 but one list has 10 elements (values) while the other has only 9. The dimension of the lists are different (mismatched) because one is 10 and the other 9.

Another case is if you are manipulating matrices such as adding a3x3 matrix to 3x2 matrix. Both matrices have the same number of rows but different numbers of columns.

Yes. Since there's far too much material for a single post, please refer to the chapter "Matrices" in the Guidebook. If you've misplaced your guidebook, you can download a new one from http://education.ti.com

Hi,
If I understand correctly you want to perform matrix calculations on matrices the coefficients of which may be numbers and/or letters (variables, parameters). While you can calculate on numerical matrices, you cannot do so with matrices with non numerical coefficients. this calculator does not know symbolic algebra.

For symbolic algebra and calculus you would need a calculator with a CAS, Computer Algebra System. Exemples of those are the TI89, Ti92, Ti Voyage 200 PLT, The Casio FX-Algebra, the Casio ClassPad, HP48S/X/G/GX/G+, HP49G/49G+, HP50G, HP48GII etc.

Hope it Helps.
Thanks for using FixYa and for rating this solution.

The problem is with the data. The calculator is telling you that your matrix is singular. Inverting a singular matrix is analogous to dividing by 0. Just as you can't divide by 0, you can't invert a singular matrix.

If you think that the inverse exists, double check the entries in the matrix.