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Tutors Answer Your Questions about Matrices-and-determiminant (FREE)
Question 241047: The sum of 3 numbers is 26. The second number is three times the first while the third number is four more than the first. What are the three numbers?
I just need help setting it up. I can use Cramer's rule well enough, I'm just not sure what to put into it to solve it.
Click here to see answer by jsmallt9(3758)  |
Question 242679: How do you do row reduction? I have no problem using elimination to find the values of variables in a system and can do so relatively quickly. However, my daughter is struggling with math and is trying to learn to handle matrices. I never had these, but can do the adding, multiplying. Now she has to learn row reduction and the book she has really does not explain it well. If you are given what to do it is easy (like when they say "-3R1 +R 2 = R 2), but how do you do it when not given what to do? Is there a set formula or steps to take like add row one to row 3 and replace row 1. I need a simple explanation on how to do this. To me it takes a lot longer to figure the necessary steps by trial and error than to use elimination. I have to be missing something somewhere. The book she is using is "Discovering Advanced Algebra, An Investigative Approach. Frankly I do not what to spend my time investigating math; I just want to know how to do it so I can pass it on to my daughter.
What is the Cramer rule?
Click here to see answer by stanbon(75887) |
Question 243802: How would you find the determinant of the n x n matrix:
a b 0 0...0
0 a b 0...0
0 0 a b...0
...........
0 0 0 0...b
b 0 0 0...a
I understand that i need to use laplace expansion but this problem is confusing me just because you dont know the numbers in the matrix or exactly how many rows and columns you are working with
Click here to see answer by jim_thompson5910(35256) |
Question 250005: 19. Give the solution for a system with the augmented matrix shown below
[1 0: 2]
[0 1: -3]
18. Write the system of linear equations represented bt the matrix equation shown below
[1 -1 1] [x] [1]
[2 1 3 ] . [y]= [-3]
[4 2 -1] [z] [2]
PLEASE HELP TONIGHT!!!!!!!!!!
Click here to see answer by Edwin McCravy(20054)  |
Question 250328: A clerk can add 40 columns of figures an hour by using an adding machine and 20 columns of figures an hour without using an adding machine. The total of number of hours it would take him to add 200 columns if he does 3/5 of the work by machine and the rest without the machine is?
Click here to see answer by ankor@dixie-net.com(22740)  |
Question 250913: The book says to solve the system of linear equations.
8x-2y+z=32
6x+1/2y+1/4z=26
x+y-5y=-14
I have tried all the ways I know to solve it and am still getting lost. Will you help me with the different ways to solve this problem and the steps.
Thank you
Click here to see answer by MRperkins(300)  |
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