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Tutors Answer Your Questions about Matrices-and-determiminant (FREE)
Question 157757This question is from textbook Precalculus
: Provide an example of a matrix that has no solution. Use row operations to show why it has no unique solution. Also, some matrices have more than one solution (in fact, an infinite number of solutions) because the system is undetermined. (In other words, there are not enough constraints to provide a unique solution.) Provide an example of such a matrix, and show, using row operations, why it is underdetermined.
This question is from textbook Precalculus
Click here to see answer by MathLover1(1183)   |
Question 160610: [ 8 10 -17]
[-5 -2 11]
[16 9 15]
[-4 20 4]
[-5 5 -15]
[-17 -7 -1]
I need to find the product of the two matrices. I know they look a little funny,im not sure how to get them set up right. The first one is a (3X3) and the second a (3x3), so i know it is defined, and the product is able to be found. I can do addiction,but im completly confused by multiplication. Id love to see the step and the correct answer. I really appericate your help!
Click here to see answer by Edwin McCravy(2922)  |
Question 161857: Calculate the area of the triangle with the following vertices:
(-3, -3), (0, -3), (1, 1)
4 sq units
12 sq units
6 sq units
15 sq units
9 sq units
2 sq units
This is multiply choice, and the possible answers are above as you can see. I have tried everything I can think of to come across the correct answer, but im so confused. I would really apperciate someone explaining how to get the correct answer and what the answer is. Thank you so much!
Click here to see answer by Earlsdon(4900) |
Question 162222: Our teacher didn't explain much about using Cramer rule with fractions so im at a lost at this equation.
{(2/3)x + (1/5)y = 3
{(3/2)x + (5/3)y = (2/3)
If it makes it any easier, our teacher said we can also use subtitution and elimination method.
Click here to see answer by stanbon(26291) |
Question 162512: Calculate the area of the triangle with the following vertices:
(-8, -2), (-1, -11), and (-1, -2)
I tried my best, and got an answer of 31.5 sq units. I just want to know if this is correct,and if not, see the steps to come to the correct answer and what it is. I thank you very much for your time!
Click here to see answer by Fombitz(2113)  |
Question 162512: Calculate the area of the triangle with the following vertices:
(-8, -2), (-1, -11), and (-1, -2)
I tried my best, and got an answer of 31.5 sq units. I just want to know if this is correct,and if not, see the steps to come to the correct answer and what it is. I thank you very much for your time!
Click here to see answer by scott8148(3382)  |
Question 162512: Calculate the area of the triangle with the following vertices:
(-8, -2), (-1, -11), and (-1, -2)
I tried my best, and got an answer of 31.5 sq units. I just want to know if this is correct,and if not, see the steps to come to the correct answer and what it is. I thank you very much for your time!
Click here to see answer by josmiceli(3012) |
Question 162528: Find matrix X:
3. [6 5] [4 -2] * X = [18 49] [-20 6]
I'm so confused with this problem. I would love to see the correct steps,and correct answer. I could really use some help with this, Thank you so much for your time!
Click here to see answer by Fombitz(2113) |
Question 162532: Find matrix X:
4. [3 4] [-3 -2] * X = [10 -10] [-8 8]
I have no clue where to even begin with this, I apperciate any help you have to offer me, id love to see the steps and correct answer. Thank you so much!
Click here to see answer by Fombitz(2113) |
Question 162554: 9. (4, -10), (1, -1)
x y 1 x y
4 -10 1 4 -10
1 -1 1 1 -1
(x)(-10)(1)+(y)(1)(1)+(1)(4)(-1)+(1)(-10)(1)-(-1)(1)(x)-(1)(4)(y)=
-10x+y+(-4)-(-10)-(-x)-4y=
-9x-3y+6=0
-9x-3y=-6
-3y+(-9x)=-6
-3y=-6+9x
-y=2+3x
Y=-3x-2
Can you find my sign error? Im sure im just overlooking something,but I can't find it. Thank you so much!
Click here to see answer by checkley77(7072) |
Question 162569: Question 162554: 9. (4, -10), (1, -1)
x y 1 x y
4 -10 1 4 -10
1 -1 1 1 -1
(x)(-10)(1)+(y)(1)(1)+(1)(4)(-1)+(1)(-10)(1)-(-1)(1)(x)-(1)(4)(y)=
-10x+y+(-4)-(-10)-(-x)-4y=
-9x-3y+6=0
-9x-3y=-6
-3y+(-9x)=-6
-3y=-6+9x
-y=2+3x
Y=-3x-2
Can you find my sign error? Im sure im just overlooking something,but I can't find it. Thank you so much!
checkley77 was nice enough to try to help me,but im still confused. I see that instead of (x)(-10)(1)+(y)(1)(1)+(1)(4)(-1)+(1)(-10)(1)-(-1)(1)(x)-(1)(4)(y)=
I needed to have (x)(-10)(1)+(y)(1)(1)+(1)(4)(-1)-(1)(-10)(1)-(-1)(1)(x)-(1)(4)(y)=
But I want to know if that effects my answer? Is Y=-3x-2 correct?
Click here to see answer by checkley77(7072) |
Question 166219: can someone please help:
Determine whether the two matrices are inverses of each other by computing their product.
1.
2, -1, 0
-1, 1, -2
1, 0, -1
2.
1, -1, 2
-3, -2, 4
-1, 1, 1
yes or no
Click here to see answer by Fombitz(2113) |
Question 166219: can someone please help:
Determine whether the two matrices are inverses of each other by computing their product.
1.
2, -1, 0
-1, 1, -2
1, 0, -1
2.
1, -1, 2
-3, -2, 4
-1, 1, 1
yes or no
Click here to see answer by jim_thompson5910(13794) |
Question 166298: A snack bar cooks and sells hamburgers and hotdogs during football games. To stay in business, it must sell at least 10 hamburgers, but cannot cook more than 40. It must also sell at least 30 hotdogs, but cannot cook more than 70. The snack bar cannot cook more than 90 items total. The profit on a hamburger is $0.33 and on a hotdog it is $0.21. How many of each item should it sell to make the maximum profit?
Click here to see answer by Mathtut(3670) |
Question 166540: can somoene please show me how to do this problem:
Solve the matrix equation for X.
A =
[2; 2; 0]
[-4; -3; 2]
[0; -3; -5]
B =
[-10]
[2]
[-9]
AX = B
a.
[-113]
[108]
[-63]
b.
[-113]
[108]
[-65]
c.
[-118]
[109]
[-63]
d.
[-113]
[107]
[-62]
Click here to see answer by stanbon(26291) |
Question 166537: can someone show me how to do this problem:
Barnes and Able sell life, health, and auto insurance. Sales for May and June are given in the matrices.
M =
[20,000; 15,000; 8000]
[30,000; 0; 17,000]
J =
[70,000; 0; 30,000]
[20,000; 25,000; 32,000]
Find the matrix that would give total sales for the months of May and June.
a.
[90,000; 15,000; 38,000]
[50,000; 25,000; 49,000]
b.
[90,000; 15,000; 38,000]
[50,000; 25,000; 32,000]
c.
[90,000; 0; 38,000]
[50,000; 0; 49,000]
d.
[140,000; 40,000; 87,000]
Click here to see answer by stanbon(26291) |
Question 166576: can someone please help me with this problem:
Find the order of the matrix product AB and the product BA, whenever the products exist.
A is 2 x 1, B is 1 x 1
a. AB is 2 x 1, BA is nonexistent.
b. AB is nonexistent, BA is 1 x 2
c. AB is 1 x 2, BA is 1 x 1
d. AB is 2 x 2, BA is 1 x 1
Click here to see answer by stanbon(26291) |
Question 167138This question is from textbook
: can someone please show me how to do this problem:
Find the inverse, if it exists, of the given matrix
[2 -1 0]
[3 -2 0]
[-2 3 1]
a.
[2 -1 0]
[3 -2 0]
[-5 4 -1]
b.
[1 -1 0]
[3 -2 1]
[-5 4 -1]
c.
[2 -1 0]
[3 2 0]
[-5 4 1]
d.
[2 -1 0]
[3 -2 0]
[-5 4 1]
This question is from textbook
Click here to see answer by Edwin McCravy(2922) |
Question 167529: The graph of f (x) = ax2 + bx + c passes
through the points (1, k1), (2, k2), and (3, k3). Determine a,
b, and c for
(A) k1=-2, k2 = 1, k3 = 6
(B) k1 = 4, k2 = 3, k3=-2
(C) k1 = 8, k2=-5, k3 = 4
I attempted to solve as follows:
(A)-2= a + b + c
1= a - b + c
6= 4a + 2b +c
and entering this into a matrix, but it doesn't come out right.
What am I doing wrong?
Thank you!
Debi
Click here to see answer by Edwin McCravy(2922) |
Question 168210: In the chemistry lab, a certain acid is stored in two different dilutions. One bottle cotains a weaker solution that is only 25% acid , but another has a stronger solution of 65% acids. Students must pour some from each container to make 60 ml of a solution that is 50% acid. How much from each container should be used
Click here to see answer by stanbon(26291) |
Question 168218: a box in the textbook warhouse has the given label It contains some Algebra 2 textbooks (each costs $84 and weighs 5.2 pounds) some Chemistry books (each costs $90 and weighs 4.4 pounds) and some Liteature books (each costs $75 and weighs 6 pounds). How many of each type of book are in the box
Smart School Publishing
Quantity: 17 Books
Weight: 84.4 pounds
Value: $1,449
Click here to see answer by stanbon(26291) |
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Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900
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