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

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Question 914130: how to solve ordered triple as 6x+2y-3z=-17 7x-5y+z=72 2x+8y+3z=-21
Click here to see answer by MathTherapy(10549)

Question 914755: Please help me solve 2X plus 5Y equals 145 and X plus Y equals 50 matrix
Click here to see answer by MathLover1(20849)

Question 914840: Show that
Det A
x+2y x+6y x+4y
x+3y x+7y x+5y = 0
x+4y x+8y x+6y
Click here to see answer by Fombitz(32388)

Question 915404: x+2y+3z=17
3x+2y+z=11
x-5y+z=-5
Use Cramer's rule to solve the values of x,y and z.
Click here to see answer by ewatrrr(24785)

Question 915423: How do I solve this matrix equation?
5x - [1.5 3.6]= [0.2 1.3]
[-0.3 2.8] [-5.6 1.7]
Click here to see answer by Fombitz(32388)

Question 916316: Write 2x+y^2 as a 2x2 determinant
Click here to see answer by Fombitz(32388)

Question 916918: (I know this is the wrong category, but did not find a logic-related one). I did these, but am not sure the REASONS are correct. Would you please look them over for me, and find any errors?
Thank you

For each of these arguments determine whether the argument is correct or incorrect and explain why.
a) All students in this class understand logic. Xavier is a student in this class. Therefore, Xavier understands logic.
Correct. Let D(x) denote �x is in this discrete mathematics class,� and let C(x) denote �x understands logic.� ∀x(D(x) → C(x)) and D(Xavier). The conclusion is C(Xavier).
b) Every computer science major takes discrete mathematics. Natasha is taking discrete mathematics. Therefore, Natasha is a computer science major.
Incorrect.. Fallacy of denying the hypotheses.
c) All parrots like fruit.My pet bird is not a parrot. Therefore,my pet bird does not like fruit.
Incorrect. Existential instantiation.
d) Everyone who eats granola every day is healthy. Linda is not healthy. Therefore, Linda does not eat granola every day.
Incorrect. Universal generalization.
Click here to see answer by JulietG(1812)

Question 916973: 4x+y+3z=11
2x-3y+2z=9
x+y+z=-3
Click here to see answer by mananth(16946)

Question 917703: Use matrices to solve the system of equation.
3x-2y+4z=4
x+y+z=3
6x-2y-3z=10
Click here to see answer by Fombitz(32388)

Question 918064: solve using matrices
3x-y_z=-15
x+2y-z=1
2x+3y-2z=0
Click here to see answer by richwmiller(17219)

Question 918215: A security firm borrowed $900,000 for business expansion.
Click here to see answer by richwmiller(17219)

Question 918239: A man has $215,000 invested in three properties. One earns 12%, one 10% and one 8%. His annual income from the properties is $20,600 and the amount invested at 8% is twice that invested at 12%.
Click here to see answer by richwmiller(17219)

Question 917672: Use matrices to solve the system of equation.
3x+4y=-12
9x-2y=6
Click here to see answer by Fombitz(32388)

Question 917643: Use matrices to solve the system of equation.
2x+y+3z= 3
-2x-y+z=5
4x-2y+2z=2

Click here to see answer by Fombitz(32388)

Question 918626: find the intersecting point of 2x+3y=1 and x+y=2
Click here to see answer by Fombitz(32388)

Question 919037: 2X+3y-5=0
X-Y+2=0
-X-2Y=-3
Click here to see answer by Alan3354(69443)

Question 919038: 2X+3y-5=0
X-Y+2=0
-X-2Y=-3
solve by cramars rulers
Click here to see answer by Alan3354(69443)

Question 919124: 1x+2y+3z=-5
3x+2y-2z=-13
5x+3y-1z=-1
Solution for three variable elimination.
Click here to see answer by Alan3354(69443)

Question 920932: Solve each system of equations.

5x + 5y = 3
5x � 3y = 27

Click here to see answer by ewatrrr(24785)

Question 921127: x+2y-4z=2
y+z=5
z=3

Click here to see answer by jim_thompson5910(35256)

Question 921147: Solve a system of equations by using a matrix
X-y+z=0
3x-2y+6z=9
-x+y-2z=-2
I solved by elimination to get (1,3,2) but not sure how to solve with matrix other than putting it in matrix form
1 -1 1 | 0
3 -2 6 | 9
-1 1 -2 | -2
Click here to see answer by josgarithmetic(39613)

Question 921968: the question is asking,using any of the matrix methods find solutions simultaneous equations.
x+3y+3z=3
x+4y+3z=8
x+4y+4z=2.
please help me

Click here to see answer by Edwin McCravy(20054)

Question 921950: Question is that I have x+y=5
x+z=6
y+z=7
Please solve this question.
I can't do this.
Regards
Faraz Saleem
Click here to see answer by rothauserc(4718)

Question 923156: without using cocept of inverse of a matrix , solve the following matrix equation:
5 4 x=1 -2
1 1 1 3
where x is a 2�2 matrix.
Click here to see answer by Fombitz(32388)

Question 923560: solve the system y-3z=-12 -2+y+2z=5 2x+3z=7
Click here to see answer by TimothyLamb(4379)

Question 923558: solve the system -32+3z=4(x-2y), 4(x-2y-z)=-36, -2(2x+y)+2z=-12
Click here to see answer by TimothyLamb(4379)

Question 924406: Evaluate AB if possible.
http://my.thinkwell.com/questionbank/94001-95000/94774/img/237347.jpg
Click here to see answer by Theo(13342)

Question 924408: Solve using Cramer's rule.
6x + 5y = 25
7x − 9y = 44
Click here to see answer by Fombitz(32388)

Question 924368: y=-1+x y=4+z z=-1-x solve the question using cramer rule
Click here to see answer by Fombitz(32388)

Question 924400: Math help please!

Identify entry Q23 .
http://my.thinkwell.com/questionbank/94001-95000/94760/img/237292.jpg
Click here to see answer by Fombitz(32388)

Question 924367: y=-1+x y=4+z z=-1-x solve the question using cramer rule
Click here to see answer by Fombitz(32388)

Question 924381: y=-1+x y=4+z z=-1-x solve the equation using Cramer rule
Click here to see answer by Fombitz(32388)

Question 925711: 3x=5-4z
X+y+z=5
Y=2z
Click here to see answer by Fombitz(32388)

Question 925711: 3x=5-4z
X+y+z=5
Y=2z
Click here to see answer by TimothyLamb(4379)

Question 925845: log(x+4)=log(5x-5) .....PLEASE HELP! -If you can go step by step with explanations that would be so helpful. Thank you!
Click here to see answer by lwsshak3(11628)

Question 925847: log(5x) = log3+log(x-2) ...Just like that; no bases. PLEASE HELP!! -If you can go step by step with explanations that would be sooo helpful. Thank you!!
Click here to see answer by lwsshak3(11628)

Question 926828: The system of equations x+2y+z=9, 2x+y+3z=7 can be expressed as
Click here to see answer by ewatrrr(24785)

Question 927075: It is known that the following is true.
|x y z|
|u v w| = 13
|1 2 3|
Use properties of determinants to find the value of the determinant below.
|x y z|
|-3 -6 -9|
|u v w|
Click here to see answer by richard1234(7193)

Question 927155: 2x-3y+2z=6
x+8y+3z=-31
3x-2y+z=-5
Click here to see answer by ewatrrr(24785)

Question 927155: 2x-3y+2z=6
x+8y+3z=-31
3x-2y+z=-5
Click here to see answer by Fombitz(32388)

Question 926276: if (x/y)=8 and y/z=4; then what is the value of x/(z+y)?
Click here to see answer by Fombitz(32388)

Question 926315: This is a Markov Chain Problem, and I simply just don't understand the process of finding steady state vectors. So if someone could work this out & explain it that'd be great
Find the steady state vector for the following transition matrix:
T=[0.2 0.9]
[0.8 0.1]

Click here to see answer by Fombitz(32388)

Question 927938: find the inverse of the matrix
0 -2 1
-5 -2 -3
7 3 4
Click here to see answer by TimothyLamb(4379)

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