Questions on Algebra: Matrices, determinant, Cramer rule answered by real tutors!

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Algebra: Matrices, determinant, Cramer rule

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Question 233846: Solve the following system of equations using matrices: x+y+z= -9, x-y+5z= -19, 5x+y+z= -29.
Click here to see answer by Alan3354(6079)

Question 22302: ok, so i have absolutly no clue on what to do with this. write each question as a matrix equation.
x + y = 5
x - 2y = -4
Click here to see answer by kings kid(1)

Question 235116: its a question on multiplying matrices. (2X3) [4 -2 -7] [-2 ](3X1 matrice) [6 3 5] [ 5 ] [ 3 ]

Click here to see answer by Edwin McCravy(2922)

Question 235410: Use a n augmented matrix to solve the system

Click here to see answer by Alan3354(6079)

Question 237084: I'm trying to help my friend who is in Algebra 2 with her homework. I took Algebra 2 last year, and we seem to have skipped over lesson 5.7, Curve Fitting With Quadratic Models.
First and foremost, how would I write a system of equations represented by a 2 by 2 matrix.
I don't want the answer, I just want to know how to solve it.
So I will use different numbers.
The first row consists of 1 and 2
the second row is 3 and 4.
After that, there's a 1 by 2 matrix where row 1 consists of x and row 2 consists of y and then it equals a 1 by 2 matrix.

Click here to see answer by stanbon(26273)

Question 237429: How would you solve the problem below using Cramer's Rule:
x+3y=-4
y+x=0
Click here to see answer by nyc_function(260)

Question 237894: Two different lines are parallel if their slopes are
Click here to see answer by Alan3354(6079)

Question 237895: Write the augmented matrix for the system of equations and solve the system using Gauss-Jordan Elimination.
10x+8y+20Z=6,000
10x+20y+40Z=11,000
100X+20y+200z=36,900
Help PLEASE :)
Click here to see answer by stanbon(26273)

Question 238372: How can i use cramers rule to solve linear system?
Click here to see answer by stanbon(26273)

Question 238407: 5x+2y=8
2x-3y=7
Click here to see answer by Fombitz(2113)

Question 238536: Use Gauss-Jordan elmination to solve the following augmented Matrix:
3 -4 2
0 -1 7
3/2 -2 1
Click here to see answer by solver91311(5072)

Question 238901: Solve using Gaussian Elimination:
3x + 4y = 7
-5x + 2y = 10

Click here to see answer by JimboP1977(76)

Question 237863: how do I find the area of a triangle using a matrice? I know what the formula is and how to put the numbers in but where do I go from there?
Click here to see answer by Photonjohn(42)

Question 239300: I can't get Cramer's Rule to work for Y. It's OK for X and Z.
the matrix is:
1X + 3Y -1Z = 1
-2X -6Y + 1Z = -3
3X + 5Y -2Z = 4
The Determinate is 2.
X = 2, Y = 1, Z = 1 using Cramer's Rule, but this doesn't check
Using RREF, the solution is 2,0,1 which works.
When I take the determinate of Y in Cramer's rule, it is not 0 which it has to be to make Y=0.
what am I doing wrong?
could it be that Cramer's Rule doesn't work some times?
Thanks
Photonjohn
Click here to see answer by stanbon(26273)

Question 237697: does the parabola open up or down?
y=4+6x-2xsquared

Click here to see answer by Photonjohn(42)

Question 237674: how doi you get the top left number in a matrix to equal one? dont know how to solve this matrix problem.
3x+2y=1
6x+4y=3
Click here to see answer by Photonjohn(42)

Question 235412: Use a n augmented matrix to solve the system
x+3y+z= -22
2x+7y-4z=-32
x-y+z=2
Click here to see answer by Photonjohn(42)

Question 234383: 1 3 1
2 1 -5
3 -1 -4
What is the identity of the matrix?
Click here to see answer by Photonjohn(42)

Question 233102: determinent of 3x3 matrixes on graphing calculator?
in specefic, the Dx and Dy
Click here to see answer by Photonjohn(42)

Question 231272: please help me solve the vortex of y=(x-1)^2-3
Click here to see answer by Photonjohn(42)

Question 240058: How do i calculate the maximum profit of -10x^2 + 1700x - 60000
Click here to see answer by stanbon(26273)

Question 240130: What does x,y,z equal.
-2x-5y+4z=21
-5x-5y=z=21
-4y-4z=8
Click here to see answer by Alan3354(6079)

Question 240269: I really need your help, Using Cramer's Rule, how would you solve this?
2x-y=4
3x+y-z=10
y+z=3
Click here to see answer by stanbon(26273)

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(591)

Question 241026: (-3,2);{3x-y=-7
5x-y=-13
Click here to see answer by Alan3354(6079)

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