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Tutors Answer Your Questions about Matrices-and-determiminant (FREE)
Question 34777: I am having a really hard time understanding the Gauss-Jordan Method. I have reviewed everything I could possibly find on this subject and it seems like there is no formal way to do this. I need a method to the madness? Please help if you can...
Use the Gauss-Jordan Mathod to solve these systems of linear equations.
Problem #1:
x+y+z=5
y+z=1
2z=4
Problem #2:
x+y=1
2x+3y=0
Your explanations of how to understand this method is greatly appreciated.
Thanks!
Click here to see answer by checkley71(8403)  |
Question 35190: The augmented matrices for three separate systems of linear equations in the variables
x, y, z, and w, respectively, have been reduced to the row echelon forms given below.
Find the solutions to each of the systems.
A =
1 0 1 −1 : 3
0 1 3 1 : −1
0 0 1 1 : 2
0 0 0 0 : 1
,
B =
1 0 0 1 : 3
0 1 0 −2 : 1
0 0 1 3 : −3
0 0 0 0 : 0
,
C =
1 1 2 −2 : 0
0 1 −3 1 : 4
0 0 0 1 : 3
So with respect to A and row four where 0=1 does that mean that this system can not be solved or can it? What is the rule here?
Click here to see answer by stanbon(57337) |
Question 35197: Use Gaussian Elimination to reduce the augmented matrix for the following system of linear
equations to upper triangular form, and use back-substitution to solve the system.
x + y − z = 3; (1)
−x + 2y + z = 0; (2)
2x − y − z = 1. (3)
The book gives the answer but not how to get the answer. Please i need to understand what they mean.
Click here to see answer by stanbon(57337) |
Question 35199: Show that AB = BA is not true in general for matrix multiplication, by offering a coun-terexample with matrices A and B of the same size. Give your own matrices.
So is the following in example
I used
A=|2,4|and
B=|2|
.....|4|
|2,4|*|2|
.........|4|
is not = to
|2|*|2,4|
|4|
have I got it right?
Click here to see answer by stanbon(57337) |
Question 33970: (1)A=[-3 2] B= [0 2] (find AB and BA if possible)
[2 -2] [-2 4]
(2)A=[-2 3] B=[ 3 ] (find AB if possible)
[1 -2] [-2 ]
[0 0]
(3)A=[2 -2 4] B=[2 1 -3 0]
[1 0 -1] [0 -2 1 -2] (find AB if possible)
[2 1 3] [1 -1 0 2]
I am having trouble with these problems i hope you can help me
thank you
Brittny
Click here to see answer by venugopalramana(3286) |
Question 39401: Please help this is a multiple choice, but I believe there are several answers,
For the rational expression 6x^2+9x-2/(x-3)^2(x+5) choose all of the terms below that are included in its partial fraction decomposition. The choices are
a) A/x^2+2x-15
b)A/x+5
c)B/x-3
d)C(x-3)^2
Thanks
Click here to see answer by fractalier(2101)  |
Question 39759: Gauss Jordan...Please Help
A system of three linear equations in the variables x,y and z is represented by an augemented matrix. The first two rows of this augmented matrix are shown. Using the Gauss Jordan method to solve the system, the next step is to make the entry in row 2, column 1 equal to zero by multipling row 1 by a constant and adding that result to row two. Now I am stuck I keep not getting the right answer to complete row two of the new augmented matrix...
1 3 4 2 I have...1 3 4 2
4 5 7 9 0 .. .. ..
Click here to see answer by fractalier(2101) |
Question 42078: Could you please solve this for me using cramer's rule...I have tried 3 times and I keep getting different answers, and none of them are the given answers.
-x-4y-z=-3
-2x+2y-6z=-3
-x-4y-z=-3
She said that the first and the third equation are a hint...I'm confused please help!
Click here to see answer by psbhowmick(529)  |
Question 42586: A single dose of a dietary supplement contains 0.2 gram of calcium and 0.2 gram of vitamin C. A single dose of a secondary supplement contains 0.1 gram of calcium and 0.4 gram of vitamin C. If a person wants to take 0.6 gram of calcium and 1.2 grams of vitamin C, how many doses of each supplement should she take?
I'm guessing you have to write a system of equations but I'm not sure how it should be. This is my guess:
(a= calcium, c= vitamin C)
0.2a + 0.2c = ?
0.1a + 0.4c = ?
I don't know if that's anywhere near correct but if it is, I have no clue what the equations should equal to. Please help! Thank you.
Click here to see answer by Nate(3500) |
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