How can I use a TI-83 calculator to solve a system of 3 equations in 3 unknowns?

Question

I know how to input it as a matrix but after that i am stumped!

ahh! yes...thanks chipotle!!!! I have a final tomorrow! Thanks for the help!!

Answer 1

Solve using Matricies. Push the Matrix button (YOu may have to use the 2nd button, depending which model you have), and go to edit. Set the Matrix as a 3 x 4. Now, you have 3 equations, a + b + c = D, or something like that. For the first Matrix row, for an equation like that, you'd enter 1, 1, 1, and d(the answer), simply like that (Because they're each being multiplied by an implied 1). Say your 2nd equation was -3a + c - b=14. You'd move the b into order, and get -3a - b + c = 14. Now, for row 2 of your matrix, enter -3, -1, 1, and 14. Repeat for the last row. Save your matrix, push the Matrix button again, push the right button, and scroll down the list til you see "rrev(". Select that, push Matrix again, and select the matirx with saved data (probably [A] in this case). Push the ) button, and enter. The answer will show a 3 rowed Matrix, each row having a 1. YOu want the last number of each row, which will be the answer for a, b, and c respectively.

Answer 2

Press 2nd, Matrix, go to the second menu, all the way to the bottom is

rref(

Likely one of the tools of the 83 I find most useful, it stands for reduced row echelon form, don't worry about that though, just click on it, then go to the matrix you entered in and click on that, you should have this on your screen:

rref([A]

Then press enter, The answers on your far right are the answers x , y, z in order

Answer 3

After you put in in the augmented matrix go to
MATRIX
MATH

scroll down to rref

MATRIX
NAME

(choose the name of your matrix)

Answer 4

if you don't have it then downloaded from the texas company website the application is poly-simultaneous.

Answer 5

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