# 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 620164: Matrix: A= [5,2,1_7,6,3_1,0,2] B=[1,4,0_2,-1,2] Find AB if possible. If i'm on the right track AB is not possible because it is a 3x3 times a 2x3... It also asks for: 1. Find BA if possible, if not explain For this i ended up with [33,26,13_5,-2,3] but I am not confident in my answer 2. Find 3A-4B if possible Any help would be greatly appreciated. Thanks Click here to see answer by ewatrrr(10682)

 Question 620491: Help find the maximum or minimum value of the objective function, subject to the constraints graphed in this feasible region. z = x + 6y + 9 Find minimum. Click here to see answer by richard1234(5390)

 Question 620730: Respected Sir/Madam, Using Matrics Method solved the following equation x-y+z=4 x-2y-2z=9 2x+y+3z=1 I want to know the value of x,y,z, plz solved it and mailed me on this id rajnisharma005@rediffmail.com I shall be thankful to u for this Rajni Click here to see answer by lynnlo(4155)

 Question 620071: Solve the system using the inverse method. x + 2y + 3z = -2 x + y + z = -7 -x + y + 2z = -10 Click here to see answer by Edwin McCravy(8882)

 Question 622429: You have worked a system down to the following augmented matrix. What can be said of the solution? 1 0 1 5 0 1 2 11 0 0 0 0 Click here to see answer by matineesuxxx(27)

 Question 622428: You have worked a system down to the following augmented matrix. What can be said of the solution? 1 0 1 5 0 1 3 13 0 0 0 7 Click here to see answer by matineesuxxx(27)

 Question 622427: You have the following matrix, and perform the following 3 row operations. What is the resultant matrix after performing these 3 row operations? –R1 + R2  R2 2R1 + R3  R3 -4R2 + R3  R3 1 0 0 10 1 1 3 5 -2 2 0 4 Click here to see answer by Edwin McCravy(8882)

 Question 622973: Cant figure this out. perform the indicated operations and simplify Let A =matrix[3,-4_-2,5] Let B= matrix[5,-2,8_1,0,-3] and C=matrix[7,-9,0_3,-5,1_-1,6,2] Find AB+BC Thanks ahead for the help. Click here to see answer by mykasha(37)

 Question 624836: Use the determinant to find the area of the triangle with the following vertices: (-3,1) (1,-3) (2,3) I know the area should be positive, but I'm still confused. Click here to see answer by Alan3354(30983)

 Question 625234: use cramer's rule to solve the system x-2y=-9, 3x+y=1 Click here to see answer by oscargut(891)

 Question 624927: how do i solve using inverse matrix method? x+2y-z=10 -2x+3y+z=6 3x-2y+2z=19 Click here to see answer by jsmallt9(3296)

 Question 626268: Using the matrices find a general solution 2x-y+3z=5 -x+4y+4z=-1 if you could show how you did this I would really appreciate it. ty Click here to see answer by Edwin McCravy(8882)

 Question 626265: the first two rows of hte following matrix are already in trianular form. Finish the job by performing Gaussian elimination on row 3. What are the contents of row 3 after you have done so? [1 6 -2 0] 0 -3 1 5] [2 0 3 9] if you could show how you did this I would really appreciate it. ty Click here to see answer by saliiim8(6)

 Question 626896: Find the inverse of the matrix if it exists. A= [3,-1,0] [4,1,0] [0,0,4] A^-1= Click here to see answer by ewatrrr(10682)

 Question 626892: Find the inverse of the matrix if it exists. A= [2,-1,0] [2,1,0] [0,0,1] A^-1= Click here to see answer by ewatrrr(10682)

 Question 626891: Find the determinant of the matrix. A= [6,3,-6] [0,6,1] [-3,4,0] |A|= Click here to see answer by ewatrrr(10682)

 Question 626890: Find the given element of the matrix product C = AB. A= [3,1,-4,0] [2,-5,0,4] [-4,5,4,1] B= [5,-4,2] [5,5,0] [-3,0,3] [0,-1,2] C23= Click here to see answer by psbhowmick(529)

 Question 626978: The first two rows of the following matrix are already in triangular form. Finish the job by performing Gaussian elimination on row 3. What are the contents of row 3 after you have done so? [1 6 -2 0] [0 -3 1 5] [2 0 3 9] I really dont get this Click here to see answer by stanbon(57246)

 Question 627008: when solving a system of equations using Cramer's Rule, if Dx(the x is tiny and next to D)=0, Dy(y tiny next to D)=-1, and D=0, then what can you conclude? 1. the system has one solution, (0,-1,1) 2. the system is inconsistent 3. the system has one solution, (0,0,0) Click here to see answer by solver91311(16868)

 Question 627018: The firstt two rows of the following matrix are already in triangular form. Finish the job by performing Gaussian elimination on row 3. What are the contents of row 3 after you have done so? [1 6 -2 0] [0 -3 1 5] [2 0 3 9] 1. 0 0 3 29 2. 0 0 1 9 3. 0 0 3 -11 4. 0 0 -5 -11 can you please help me figure this out and show how you did it. ty Click here to see answer by stanbon(57246)

 Question 627009: the matrix below is the aufmented matrix of a system of three equations in the variables x and y. Solve for x and y. (all the numbers are in a bracket) 3 1 0 -1 0 4 2 2 1 A. one solution, (-3/2,9/2) B.no solution C. one solution (0,9) Click here to see answer by Alan3354(30983)

 Question 627192: Find the inverse of the matrix if it exists.? A= [1,-2] [1,2] A^-1= Click here to see answer by jim_thompson5910(28504)

 Question 627191: Find the given element of the matrix product C = AB. A= [4,2,-1,0] [5,-5,0,3] [-1,3,4,1] B= [4,-1,1] [1,1,0] [-3,0,5] [0,-5,2] C23= Click here to see answer by hammy(9)

 Question 628005: A person can finish his building work in 8days, but unfortunately while building every day he loses his 20% of work. inthat case how many days he can finish his building work? Click here to see answer by Edwin McCravy(8882)

 Question 628447: Find the given element of the matrix product C = AB. A= [5,5,-3,0] [1,-3,0,3] [-2,3,1,5] B= [4,-2,1] [3,1,0] [-2,0,3] [0,-1,1] C23= Click here to see answer by jsmallt9(3296)

 Question 628831: if you were solving the following system of equations using matrices, how would you set up your matrices to solve? x+y=1 2x+5y=4 Click here to see answer by Edwin McCravy(8882)

 Question 629141: Use matrices to solve the system. (If the system has infinitely many solutions, express your answer in terms of c, where x = x(c), y = y(c), and z = c. x+6y+z=0 x+2y-3z=0 x-5y-10z=0 Click here to see answer by ewatrrr(10682)

 Question 629138: 1.Find the inverse of the matrix if it exists. A= [1,-2,0] [1,3,0] [0,0,1] 2.Find the inverse of the matrix if it exists. A= [3,-1,0] [4,1,0] [0,0,4] Click here to see answer by ewatrrr(10682)

 Question 629352: Find the inverse of the matrix if it exists. A= [3,-2,0] [3,3,0] [0,0,4] Click here to see answer by Edwin McCravy(8882)

 Question 630296: solve the equations using cramer's rule, x-y-z=4; 3x-y+z=4; 2x-7y+3z=-6. Click here to see answer by ewatrrr(10682)

 Question 630512: 2x-y+8z=13;3x+4y+5z=18;5x-2y+7z=20; x= y= z= solve the following equations through gauss jordan method Click here to see answer by jsmallt9(3296)

 Question 631491: Use matrices to solve the system of equations (if possible). Use Gaussian elimination with back-substitution or Gauss-Jordan elimination. (If there is no solution, enter NO SOLUTION. If the system is dependent, set z = a and solve for x and y in terms of a.) 3x − 2y + z = 7 −x + y + 2z = −12 x − y − 4z = 20 (x,y,z)= Click here to see answer by richwmiller(9135)

 Question 631694: i have to find the rule for this step 1= 24 step 2= 22 step 3= 20 step 4= 18 step 5= 16 step 6= 14 step 7 =12 Click here to see answer by Edwin McCravy(8882)

 Question 632001: The third angle of an isosceles triangle is 16 dgree less than the sum of the two equal angles.Find three angles of tha triangle. Click here to see answer by unlockmath(1599)

 Question 632155: 4 -1 2 5 + -1 2 -2 -3 Click here to see answer by Tatiana_Stebko(1326)

 Question 632358: Solve the Following System of equations by using the inverse of the coefficent (AX=B) x+5y=25 5x+5y=45 The Inverse of matrix A, A-1 is? and what is the solution in ordered pair please just post the answers i need in the box and the soultion for the system here is screenshot of question http://oi47.tinypic.com/2cpx6l0.jpg Click here to see answer by ewatrrr(10682)

 Question 632354: Homework Question 2 need help solve the following system of equations by using the inverse of the coefficent matrix i would like if the answer was pointed out and the solution in ordered pair (AX=B) x+8y=-29 2x+3y=-19 The inverse of matrix A,A-1 is? and what is the solution in ordered pair here is a screenshot http://oi47.tinypic.com/2qwebcx.jpg just the answers i need to enter in the 4 boxes and the ordered pair please for the solution Click here to see answer by ewatrrr(10682)

 Question 632350: Solve the following system of equations by using the inverse link to question need help on (AX=B x+6y=-16 -5x+6y=8 the inverse of matrix A, A-1 is? and what is the solution link to question here http://oi46.tinypic.com/2lji6p5.jpg Click here to see answer by ewatrrr(10682)

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, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935