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

Tutors Answer Your Questions about Matrices-and-determiminant (FREE)

Question 1073711: X-2y=5, 2x-y=6
Click here to see answer by Fombitz(32388)

Question 1074117: Solve using matrices. 2x-y-z=4, x+y-5z=-4, x-2y=4 I'm trying not to use fractions like the solution key.I tried using the following: R3-R2=R3, R1-2R2=R2, 1/3R2, 3R2+R3=R3, 14R1+R3=R1, 14R2-3R3=R2, R1+R2=R1 AND THEN I get a wrong solution. What am i doing wrong?
Click here to see answer by josgarithmetic(39613)

Question 1074112: Find the standard form of the equation of the ellipse satisfying the given conditions. Foci: (0, -2), (0, 2); y-intercepts: -5 and 5
A.
x^2/4 +y^2/25 = 1
B.
x^2/4+ y^2/21 = 1
C.
x^2/25 + y^2/21 = 1
D.
x^2/21 + y^2/25 = 1

Click here to see answer by ikleyn(52750)

Question 1074377: Please help me solve the following system using the method of matrix inverses
3x + 7y = -26
2x + 37 = -14
I need to determine x and y
Click here to see answer by Fombitz(32388)

Question 1074711: Let B = [-1 3 6 -3]. Find -4B.
A. [-4 12 24 -12]
B. [-3 1 4 -5]
C. [4 -12 -24 12]
D. [4 3 6 -3]
Click here to see answer by ikleyn(52750)

Question 1074774: Solve the equation on the interval [0, 2pi).
tan^2 x sin x = tan^2 x
B.pi/2 , pi
D. 0, pi
Click here to see answer by ikleyn(52750)

Question 1074772: Find the vertical asymptotes, if any, of the graph of the rational function.
f(x) =
A. x = 4 and x = 4
B. x = 4
C. x = 0 and x = 4

Click here to see answer by stanbon(75887)

Question 1074888: How do I use creamers rule with these 2 systems of equations? I meant for the "{" curly brackets to encompass both equations in each problem.
Solve using Cramer's rule.(Hint: Start by substituting m=1/x and n=1/y.)
1. {4/x+1/y=1
{8/x+4/y=3
2. {4/x-2/y=1
{10/x+20/y=0
Click here to see answer by Fombitz(32388)

Question 1075274: A statement Sn about the positive integers is given. Write statements S1, S2, and S3, and show that each of these statements is true. Show your work.
Sn: 2 is a factor of n^2 + 7n
pls show step by step answer
Click here to see answer by stanbon(75887)

Question 1075336: The price of oil recently went from 6.90 to per case of 12 quarts . find the ratio of the increase in price to the original price
Click here to see answer by Alan3354(69443)

Question 1075270: Solve the system of equations using matrices. Use Gaussian elimination with back-substitution.
x + y + z = -5
x - y + 3z = -1
4x + y + z = -2
Pls provide step by step answer
Click here to see answer by Fombitz(32388)

Question 1075658: -5=-3(x+11)-17
Click here to see answer by Alan3354(69443)

Question 1075944:

Find BA
Click here to see answer by Edwin McCravy(20054)

Question 1076249: X-y=-3 3x+2y=-1
Click here to see answer by Fombitz(32388)

Question 1076553: 40x+3y+9z=35
15x+16y+11z=50.5
11x+10y+300z=370
Please help me to solve this, thank you!
Click here to see answer by Alan3354(69443)

Question 1076934: 1. Ichiro Suzuki holds the American League record for the most hits in a single baseball season. In 2004, Suzuki
had a total of 262 hits for the Seattle Mariners. He hit three fewer triples than home runs, and he hit three times as
many doubles as home runs. Suzuki also hit 45 times as many singles as triples.
a) Setup 4 equations using the information given, and the following variables:
s = single, d = double, t = triple, h = home run

i need to set up 4 equations and dont know where to start
Click here to see answer by Boreal(15235)

Question 1077070: CAR A TRAVELING AT 35 MILES PER HOUR. CAR B IS 200 FEET BEHIND CAR A. AT WHAT SPEED MUST CAR B TRAVEL TO CATCH UP TO CAR A?

Click here to see answer by josmiceli(19441)

Question 1077070: CAR A TRAVELING AT 35 MILES PER HOUR. CAR B IS 200 FEET BEHIND CAR A. AT WHAT SPEED MUST CAR B TRAVEL TO CATCH UP TO CAR A?

Click here to see answer by ikleyn(52750)

Question 1077157: If A and B are matrices conformable for the product AB , prove that (AB)' = B'A'.
Click here to see answer by Edwin McCravy(20054)

Question 1077538: solve
{x^2-2x=2y^2=8
2x+y=6
Click here to see answer by Boreal(15235)

Question 1077536: evaluate the determinant (3by3)
[1-1 2]
-1 2 0
-1 3 1
Click here to see answer by Alan3354(69443)

Question 1077537: Use cramer's rule to solve the following system of equations.
5x-2y=19
7x+3y=15

Click here to see answer by math_helper(2461)

Question 1078150: Using Gauss-Jordan elimination, write the following matrix
in reduced row-echelon form, unless it is an inconsistent system.

Click here to see answer by Edwin McCravy(20054)

Question 1078231: Using Gauss-Jordan elimination, put the following
matrix in reduced row-echelon form. Thanks a lot.

Click here to see answer by Edwin McCravy(20054)

Question 1078306: Solve determinants
1 a a^2-bc
1 b b^2-ac
1 c c^2-ab
Click here to see answer by ikleyn(52750)

Question 1078845: The flow of traffic through a network of streets is show below in vehicles per hour. Solve the system for the traffic flow represented by xi, i = 1, 2, 3, 4, and 5. The i in xi is a subscript//
Model: https://s7.postimg.org/wk2xokkyz/figurefor18.png
Click here to see answer by jim_thompson5910(35256)

Question 1079864: Please help me solve this question. Roy,Sally, and Jeff drive a total of 50 mi to work each day. Sally drives twice as far as Roy, and Jeff drives 10mi farther than Sally. Use a system of three equations in three unknowns to find how far each person drives each day.
Click here to see answer by ikleyn(52750)

Question 1080225: If Y=-x and X is -3 then what is Y
Click here to see answer by amfagge92(93)

Question 1080680: 2x-y+z=0
x+3y+2z=16
3x-y+z=3
Click here to see answer by Fombitz(32388)

Question 1081706: Solve by matrix method
x+y-z=1, 3x+y-2z=3,x-y-z=-1
Click here to see answer by Fombitz(32388)

Question 1081779: regla de cramer
𝑥 + 𝑦 + 𝑧 − 𝑤 = 2
2𝑥 − 𝑦 +𝑧 +5𝑤 = 9
3𝑥 + 𝑦 +𝑧 −2𝑤 = 1
2𝑥 + 2𝑦 +4𝑧 + 6𝑤 = 2
Click here to see answer by ikleyn(52750)

Question 1081779: regla de cramer
𝑥 + 𝑦 + 𝑧 − 𝑤 = 2
2𝑥 − 𝑦 +𝑧 +5𝑤 = 9
3𝑥 + 𝑦 +𝑧 −2𝑤 = 1
2𝑥 + 2𝑦 +4𝑧 + 6𝑤 = 2
Click here to see answer by MathLover1(20849)

Question 1084062: Solve 4a-3b+c=11
2a+b-4c=-1
a+2b-2c=1
By matrix inversion method
Click here to see answer by Edwin McCravy(20054)

Question 1084104: The determinant of a matrix [a, b, c, d] is equal to ad-bc. If [x-y, 3, x-y,3] = k, then what must k be equal to in order for x=y to be true?
Click here to see answer by ikleyn(52750)

Question 1084344: Consider the following invertible matrix A, and vector B.
A =
2 4 4 3 8
7 10 10 5 2
1 6 8 7 5
5 5 4 10 5
5 1 7 6 3
, B =
3
5
7
10
6
.
Use Cramer's Rule to solve the following.
(a) Solve the equation AX = B for the variable x3 .
(b) Solve the equation AX = B for the variable x4 .

Click here to see answer by ikleyn(52750)

Question 1084343: Consider the following system of equations.
4x + ay = −1
5x + by − 5z = −2
5x + cy + 3z = 0
And let
A =
4 a 0
5 b −5
5 c 3

Suppose that det(A) = 5. Use Cramer's rule to solve the above system for the variable y
Click here to see answer by ikleyn(52750)

Question 1084436: need help making sure i have the right solution for:
solve the system using determinants:
7x+3y=1
3x+4y=5
I have it reduced to 4x+ 19y= 32 is this the final answer?

Click here to see answer by MathLover1(20849)

Question 1084446: hi :)
I need help setting up a system of equations for this word problem:
Joe bought 100 sandwiches. He paid $1.25 each for the ham sandwiches and $.95 for the pb&j sandwiches. the total bill was $109.80

Click here to see answer by ankor@dixie-net.com(22740)

Question 1084449: i need help with this Matrix
1 5 |
2 6 | x 1/2 R2 into R2
so I need to multiply the matrix by 1/2 of row 2 and put it into row 2
I've done it and think it looks like this but I am not sure
1 5
1 3
Click here to see answer by rothauserc(4718)

Question 1084469: I need help with this problem. I am supposed to solve this system using determinants and I am getting reallly confused!!
7x+3y=1
3x + 4y= 5
help :)
Click here to see answer by Boreal(15235)

Question 1085778: 1) Evaluate A + B when
A=[-4 2 3] and B=[-2 3 -1]
[0 -1 -4] [1 5 -4]
2) Evaluate 2A - 3B when
A=[-4 2 3] and B=[-2 3 -1]
[0 -1 -4] [1 5 -4]
3) Evaluate C - B when
A=[- 4/3 3/2] and B=[-1 1/2]
[0 -1] [2 - 1/2]
4) Evaluate C - (B + A) when
A=[- 4/3 3/2] and B=[-1 1/2] and C=[- 1/3 1/2]
[0 -1] [2 - 1/2] [1/4 2]
5) Evaluate 1/3 B -1/2 A when
A=[- 4/3 3/2] and B=[-1 1/2] and C=[- 1/3 1/2]
[0 -1] [2 - 1/2] [1/4 2]
Click here to see answer by Fombitz(32388)

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