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

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 Algebra: Matrices, determinant, Cramer rule Solvers Lessons Answers archive Quiz In Depth

 Question 472804: Which is the transformation matrix for a positive rotation of 250 degrees about the origin? a) -sin 250 cos 250 cos 250 -sin 250 b) cos 250 -sin 250 sin 250 cos 250 c) cos 250 -cos 250 cos 250 cos 250 d) sin 250 -cos 250 cos 250 sin 250 I really don't understand what they mean by transformation matrix...please help if you can! Click here to see answer by stanbon(57361)

 Question 472985: Does the system have a solution? If so, could you help me find it? x+y=9 5x+y=29 x-y=2 How do I graph the function f(x)=[x-2]+3? How do I solve the system : x-y+z=1 2x+2y=4 -x+4y+3z=6 Thank you for your time. Click here to see answer by stanbon(57361)

 Question 473485: What is w,x,y, and z when using matrices to solve the following system? w-3x-2y+z=-3 2w-7x-y+2z=1 3w-7x-3y+3z=-5 5w+x+4y-2z=18 Click here to see answer by Alan3354(30993)
 Question 473485: What is w,x,y, and z when using matrices to solve the following system? w-3x-2y+z=-3 2w-7x-y+2z=1 3w-7x-3y+3z=-5 5w+x+4y-2z=18 Click here to see answer by Edwin McCravy(8909)

 Question 473608: Solve for X X 1 8 1 X -4 0 1 8 a. 0 or 1/8 b. 0 or -1/8 c. 1/8 d. -1/8 Click here to see answer by Alan3354(30993)

 Question 473872: find all solutions of the system of equations. {x + sqrt (y) = 0 {y^2 - 2x^2 = 3 Click here to see answer by robertb(4012)

 Question 474015: what are the x,y,z coordinates of -9x-9y-9z=27 -4x-7y+9z=-16 -5x-7y+2z=-2 Click here to see answer by stanbon(57361)

 Question 474016: what are the x,y,z coordinates of -7x-8y+2z=-6 -8x-2y-4z=-12 -3x-9y+5z=6 Click here to see answer by Edwin McCravy(8909)

 Question 474032: what are x,y,z coordinates of -x-8y+4z=7 -7x-y+2z=-12 0x+y-z=1 Click here to see answer by MathLover1(6634)

 Question 474507: Solve the following system of equations using a matrix. 3x-5y+z=-8 4x+y-z=46 5x-7y+3z=0 Click here to see answer by stanbon(57361)
 Question 474507: Solve the following system of equations using a matrix. 3x-5y+z=-8 4x+y-z=46 5x-7y+3z=0 Click here to see answer by Alan3354(30993)

 Question 474567: Find the value of |5 3 -2| |1 0 4| |4 1 2| Click here to see answer by ewatrrr(10682)

 Question 475047: I am reading my solutions and I don't understand how I get from one tableau to another. We pivoted around the second row and second column. 1 2 4 1 0 0 | 8 3 8 1 0 1 0 | 10 -4 -32 1 0 0 1 | 0 to 1 0 15 4 -1 0 | 22 3 8 1 0 1 0 | 10 8 0 5 0 4 1 | 40 Click here to see answer by solver91311(16897)

 Question 475251: x + 2y + 2z = 25 2x + y + z = 17 2x + 2y + z = 20 Click here to see answer by stanbon(57361)

 Question 475818: Good afternoon! I was wondering if I could get a jumpstart on how to perform this matrice: x+y-z=-2 3x-4y+5z=1 2x-2y+7z=0 Thank you for your help. I appreciate it. Click here to see answer by stanbon(57361)

 Question 476101: Matrix algebra is KILLING me! I need to know how to find the determinant for a problem like this, for example: 4 2 -3 1 -2 4 1 1 1 Click here to see answer by jim_thompson5910(28595)

 Question 476246: how many different second order determinant can be formed from four different numbers? Click here to see answer by Tatiana_Stebko(1326)

 Question 477307: How would I solve the system: 2x+6y=8 -5x-y=-6 I tried using elementary row of operations but I keep getting stuck. Click here to see answer by robertb(4012)

 Question 479115: Solve the following matrices using these operations 5A, A - B, AB, BA 1. a = [ 1 5 ] b = [ 8 1 ] *they are columns, not rows, i dont know how to make a column. like [ 1 5], it is a column so it's like 1/5 Click here to see answer by Tatiana_Stebko(1326)

 Question 479405: Minimize C = x +y with the following constraints: O~x~4 O~y~4 2x - 3y ~ -1 -x + Y L 0 Click here to see answer by solver91311(16897)

 Question 479644: Hi Matrix A -3 1 3 -2 5 -4 4 -2 -1 Matrix B -3 -5 -3 2 -1 4 -5 -2 -5 Find BA Thank you Click here to see answer by Edwin McCravy(8909)

 Question 480456: The following equations have infinitely many solutions x + 3y =3 -x + 7y + 5z =18 -2x + 6y + 6z =24 Give the right hand side of the vector form of the general solution, using a parameter such as s or t. (Any lowercase letter will do as a parameter, so long as it is not x, y or z.) FOR EXAMPLE, for the equations x = y + 1, y = z + 1, z = x − 2 one correct answer is [x, y, z] = [0, −1, −2] + t [1, 1, 1] and you would enter the right hand side of this equation in the space provided: [0, −1, −2] + t * [1, 1, 1] Click here to see answer by Edwin McCravy(8909)

 Question 483646: Find the solution to the following system of equations using the Gauss-Jordan method. 3x + y = 1 x - y = 1 Click here to see answer by jorel1380(2518)

 Question 483654: Use Cramer's rule to solve the following system of equations. If D = 0, use another method to solve the system. A. (3, 8) B. (8, 3) C. (-8, 3) D. No solution E. None of the above Click here to see answer by Alan3354(30993)

 Question 485291: the matrix X23 2X3 = 0 23X solve for value/s of X..thanks Click here to see answer by Tatiana_Stebko(1326)

 Question 485960: Solve the equation using the inverse of the coefficient matrix: 4x+y-4z=17 2x+y-z=12 -2x-4y+5z=17 Click here to see answer by Edwin McCravy(8909)

 Question 487330: Hello, this question is not about matrices, but I could not find a category that corresponded with my question! A Chevrolet dealer has 160 new cars for sale on her lot. Among these cars, 50 have four-cylinder engines, 80 have a tilted steering wheel, 30 have power windows, 42 have four-cylinder engines and a tilted steering wheel, 18 have four-cylinder engines and power windows, 15 have all three features, and 65 have none of the features. How many of these cars have a tilted steering wheel and power windows? How many cars have at least one of these features? How many cars have exactly 2 of these features? Thanks so much. Click here to see answer by josmiceli(9681)

 Question 488031: a company offers a starting yearly salary of \$39,000 with raises of \$2,200 per year. Find the total salary over a ten year period Click here to see answer by John10(245)

 Question 491415: What is the solution to the problem (2t-7)(2t-7)? Click here to see answer by rfer(12660)

 Question 493960: -4a + b + 5c = 19 6a- 3b -5c = -21 -a - 2b - 6c = -17 My Question What Would Be The Marix ? Will It Have A Soultion Or No ? Click here to see answer by stanbon(57361)

 Question 494511: Matrix A 5 1 0 -2 3 1 0 2 4 Matrix B -1 2 -3 0 5 4 2 -1 2 Click here to see answer by MathLover1(6634)

 Question 499824: 1a + 2b + 1c = 5 1a - 1b - 1c = 3 0a + 1b + 1c = 2 Click here to see answer by MathLover1(6634)

 Question 499819: +5 - 2 = 27 -3 + 5 = 18 2x3 matrix. Click here to see answer by Alan3354(30993)

 Question 499814: 0 + 2 - 1 = -7 1 + 4 + 1 = -4 5 - 1 + 2 = 13 Click here to see answer by Alan3354(30993)

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