# please check my answers 1.Use Gaussian elimination to write the system of equations given below in row-echelon form. 2x+4y+z=-4 2x-4y+6z=13 4x-2y+z=6 answer:2x+4y+z=-4 8y-5z=-17 z=1 2.Find the solution to the system of equations given below. x+y+z=2 -x+3y+2z=8 4x+y=4 answer: 0,4,-2 3.Find

72,928 results
1. ## finite math

Solve the system of linear equations using the Gauss-Jordan elimination method. 3x−2y+ 4z = 22 2x+y− 2z = 3 x+ 4y − 8z = −16

2. ## algebra

Plumber chargers \$60 an hour. Plumber B chargers \$40 to visit your home plus \$55 for each hour. for hop many hours will the total cost for each plumber be the same? how much will that cost be? Define your variables: Write a system of equations: solve the

3. ## gaussian elimination

4. Solve the following linear system using Gaussian elimination. Show work. 3x + y – z = -5 -4x + y = 6 6x – 2y + 3z = 2 how about looking at http://www.mathwords.com/g/gaussian_elimination.htm

4. ## math

solve the system of equations by elimination. 3x-4y=22 2x+5y=7

5. ## algebra

Dorothy is thinking of two numbers. The sum of the numbers is 40 and the difference is 6. write a system of equations and use elimination method to find the two numbers.

6. ## precalculus

When using Gaussian elimination to solve a system of linear equations, explain how you can recognize that the system has no solution. Give an example that illustrates your answer.

7. ## algebra

Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. x+3y+6z=6 y-4z=0

8. ## PRE - CALCULUS

Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. Show your work. 4x-y+3z = 12 x+4y+6z =-32 5x+3y+9z = 20 ...... I NEED HELP WITH THE OTHER TWO PLEASE :) 4 -1 3 | 12 1 4 6 | -32 5 3 9 | 20 1 0 0 0

9. ## Algebra 2

1.) Write a system of equations that has NO solution. 2.) If you wanted to eliminate the y variables in the system of equations below, what would you multiply the first and second equations by?( Do not solve the equation) 2x-3y=8 7x-4y=11

10. ## Algebra

Find the number of the solutions to each system. a. 4x-y+1=0 4x-y+3=0 b. 2x-y+4=0 4x-2y+8=0 Write a question that can be solved using a system of linear equations. Solve the following system of equations by graphing: y=x+3 and y=-2x-3

11. ## math

Use elimination to solve each system of equations. x+y=3 2x-3y=16

12. ## math

Solve the system of equations by elimination. (2 marks) y=2x^2-2x-3 y=-x^2-2x-3

13. ## matg

Solve the system of equations by the elimination method 9/x++3/8y=-9/4 and -1/9x+5/4y=1/9

14. ## math

Find the solution to the system of equations given below using elimination by addition. 5x + 20y = 40 x + 3y = 6

15. ## math

Solve the system of equations by elimination. Express the solution as an ordered pair. −5x−2y=−12 3x+2y=8

16. ## linear algebra

which of the following sets of vectors span R^3? a.){(1, -1, 2), (0, 1, 1)} b.) {1, 2, -1), (6, ,3, 0), (4, -1, 2), (2, -5, 4)} c.) {(2, 2, 3), (-1, -2, 1), (0, 1, 0)} d.) {(1, 0, 0), (0, 1, 0), (0, 0, 1), (1, 1, 1)} can someone show the steps to check for

17. ## precalculus

Which of the following would be the best first step for solving the system of equations by elimination? • 6.3x + 7.2y = 5.4 • 5.6x + 6.4y = 4.8

18. ## Algebra

A: 6x − 3y = −4 B: −4x − y = 5 To solve this system of equations by elimination, what could you multiply each equation by to cancel out the x-variable?

19. ## pre - CALCULUS

Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. x + y + z = 9 2x - 3y + 4z = 7 x - 4y + 3z = -2 A. {(-7z/5+34/5 ,2z/5 +11/5 , z)} b. {(- 7z/5+34/5 , 2z/5- 11/5 , z)} c . {( z/5+ 34/5 , 2z/5+11/5

20. ## Math

Use the method of elimination to solve the following system of equations. You must check your answer: 1)x/2 + y/5 = 1/2 2) 3x - y = -8

21. ## Math

Use the elimination method to solve the system of equations 5u+2v=15 3u+v=-7

22. ## math-equation of circle

Write the standard form of the equation of the circle that passes through the points at (4,5) (-2, 3), and (-4,-3). a. (x-5)^2+(y+4)^2=49 b. (x-3)^2+(y+2)^2=50 c. (x+4)^2+(y-2)^2=36 d. (x-2)^2+(y+2)^2=25 I'm having trouble with solving for the

23. ## Algebra

Solving Linear Equations - Elimination Write whether each of these systems of equations has a common solution or not. Explain y = -x + 2 Y = 2x + 1 If you show me one and explain it, then I can probably do the rest...Thanks

Solve the following system of equations using matrices. Use Gaussian elimination with back substitution or Gauss-Jordan elimination. a. 3x1 + 5x2 - 8x3 + 5x4 = -8 b. x1 + 2x2 - 3x3 + x4 = -7 c. 2x1 + 3x2 - 7x3 + 3x4 = -11 d. 4x1 + 8x2 - 10x3+ 7x4 = -10 my

25. ## algebra

i need help with these problems (either a solution or how to plug them into a graphing calculator): 1) Solve by substitution or elimination 4/x + 1/y + 2/z = 4 2/x + 3/y - 1/z = 1 1/x + 1/y + 1/z = 4 2)Solve the system of equations by substitution. x^2 +

26. ## Physics

Which of the following statements is/are true about Gaussian surfaces? i. Gaussian surface is the name for a closed surfaces used when calculating flux in Gauss’ Law ii. A Gaussian surface can have any shape (as long as it is closed) iii. Like defining

27. ## Algebra

To solve the following system of equations by elimination, which step would best to perform first? 1/2a - 1/4b = 1 1/3a + b= 3 A. Add the two equations. B. Subtract the two equations. C. Multiply the first equation by 4. D. Divide the first equation by 3.

28. ## ALGEBRA

USE ELIMINATION TO SOLVE THE SYSTEM OF EQUATIONS {3X-2Y+X=9 X-Y+4Z=10 2X+3Y-Z=53 A)(-6,-13.2,0.7) B)(14.1,-8.6,-3.2) C)(5,0,4) D)(10,12,3)

29. ## Algebra

Find all solutions to the following system of equations: x + 3y + 2z = 6 -3x + y + 5z = 29 -2x - 3y + z = 14 This just did not work out for me. Here is my work: I first solved Equation #1 for x. x = -3y - 2z + 6 Then, I did substitution, and replaced x for

30. ## Intermediate Alegebra

Solve the system of equations by the addition / elimination method. y = 5x + 5 5y = 25x

solve the following system of linear equations by elimination. verify your solution. 1. -4x-9y=9 2. x-3y=-6

32. ## math

Solve the system of equations by Elimination OR Substitution. Explain why you chose one method over the other. 3x – 2y = 8 2x + 5y = -1

33. ## pre calculus

Use Gaussian elimination to write the system of equations given below in row-echelon form 2x+4y+z=-4 2x-4y+6z=13 4x-2y+z=6

34. ## precalculus

please check my answers 1.Use Gaussian elimination to write the system of equations given below in row-echelon form. 2x+4y+z=-4 2x-4y+6z=13 4x-2y+z=6 answer:2x+4y+z=-4 8y-5z=-17 z=1 2.Find the solution to the system of equations given below. x+y+z=2

35. ## precalculus

When using Gaussian elimination to solve a system of linear equations, explain how you can recognize that the system has no solution.

36. ## Pre-Calculus Matrix

Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. Show your work. 4x - y + 3z = 12 x + 4y + 6z = -32 5x + 3y + 9z = 20 4 -1 3 12 1 4 6 -32 5 3 9 20 I believe that the solution does not exist and

37. ## algebra

Express the system as an augmented matrix and solve using Gaussian elimination. x=+2y+z=3 2y+3z =2 -x+2z = 1

38. ## Linear Algebra

Use Gauss Jordan Elimination to write the solution of the system of equations: x1+4x2+2x3=17 3x1+x2-5x3=7 2x1-3x2-7x3=-10

39. ## math

Look at the system of equations below. 4x minus 5y equals 3 line break 3x plus 5y equals 13 A student makes this argument: Elimination is the best method for solving this system because the y-coefficient in the first equation is the opposite of the

40. ## precalculus

Use the elimination method to find all solutions of the system of equations. (Order your answers from smallest to largest x, then from smallest to largest y.) x − y2 + = 0 2x2+ y2 −9 = 0

41. ## Mathematics

Solve by Gaussian elimination method 4x+2y-5z=13 x+y+z=2 2x-y-3z=3

42. ## Algebra

Use the elimination method to solve the following system of equations. x + 3y – z = 2 x – 2y + 3z = 7 x + 2y – 5z = –21

43. ## Math Check

Hi! Can someone check these two answers? Thanks! Directions: Find the correct number of solutions for the following system of equations. 1.) 5x - 3y + 2z = 3 2x + 4y-z = 7 x - 11y + 4z = 3 2.) 2x + y- 3z = 4 4x + 2z = 10 -2x + 3y - 13z = -8 A.) One

44. ## Math

Solve the following system of equations using both substitutio and elimination y=-x+4 y=-2x-4 Do I do what I do with the previous problems

45. ## Algebra....HELP!!

Use the elimination method to solve the system of equations a + 6b =4 a + 3b = -2 What is the solution in an ordered pair?

46. ## math

1. Solve for the indicated letter D=4e, for e The solution is e= 2. G(x) = 6/(6-5x) Choose the correct domain below {x|x is a real number and x ≠0} {x|x is a real number and x≠6/5} {x|x is a real number and x≥6/5} {x|x is a real number and x ≠6} 3.

47. ## pre calculus

Use Gaussian elimination to write the system of equations given below in row-echelon form. 2x+4y+z=-4 2x-4y+6z=13 4x-2y+z=6

48. ## precalculus

Can you check my answer? If it is wrong can you please explain why and give the correct answer? Use Gaussian elimination to write the system of equations given below in row-echelon form. 2x+4y+z=-4 2x-4y+6z=13 4x-2y+z=6 answer:2x+4y+z=-4 8y-5z=-17 z=1

49. ## Math

Please help! x-2y+z=7 2x+y-z=0 3x+2y-2z=-2 a. Solve the above system of equations using Gaussian Elimination or Gauss-Jordan Elimination. You must show row operations. b. Solve the above system of equations using Cramer's Rule.

50. ## College Algebra

Please help! x-2y+z=7 2x+y-z=0 3x+2y-2z=-2 a. Solve the above system of equations using Gaussian Elimination or Gauss-Jordan Elimination. You must show row operations. b. Solve the above system of equations using Cramer's Rule.

51. ## Discrete Math

I am really stuck on these problems. I've worked a lot of them but I can't get these. Sometimes I think I know the answer but I can't show how I got it. 1.) Solve each matrix equation for X. 2X + 5A = B 2.) Find the following matrices: a. AB b. BA A= 2 4 3

52. ## pre-calc

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

53. ## pre-calc

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

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

55. ## pre - CALCULUS

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

56. ## pre-calc - JAI

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

57. ## Pre calculus

olve the system of equations using matrices. Use Gaussian elimination with back-substitution. x + y + z = -5 x - y + 3z = -1 4x + y + z = -2 I need it explained to me, how do I do this?

58. ## pre - CALCULUS

Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. Show your work. 4x-y+3z = 12 x+4y+6z =-32 5x+3y+9z = 20

59. ## pre-calc

Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. Show your work. 4x-y+3z = 12 x+4y+6z =-32 5x+3y+9z = 20

60. ## pre-calc

Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. Show your work. x+4y+6z =-32 5x+3y+9z = 20

61. ## pre - CALCULUS

Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. Show your work. 4x-y+3z = 12 x+4y+6z =-32 5x+3y+9z = 20

62. ## pre - CALCULUS

Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. Show your work. 4x-y+3z = 12 x+4y+6z =-32 5x+3y+9z = 20

63. ## Pre-Calculus

Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. Show your work. 4x - y + 3z = 12 x + 4y + 6z = -32 5x + 3y + 9z = 20 Please help me..

64. ## Math

I need to use the Gaussian Elimination to solve a system of equations, but I have no idea on how to do that. I remember doing these in high school, but since its been a while I can't remember exactly how to do it. Here's the system of equations I need to

65. ## Pre-Calculus

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 I really need help.. 1 1 1 -5 1 -1 3 -1 4 1 1 1 -2 I've done so many different methods to solve this and I get

66. ## Math Check

Hi! Can someone check my answers? Thanks! Directions: Solve each system by using the elimination method. Make sure to write your answer in (x,y) form. 1.) 3x-5y=2 2x+5y=13 2.) 3x+11y=4 -2x-5y=9 My answers: 1.) (3,7/5) 2.) (-17,5)

67. ## algebra

Please help with: Express the system as an augmented matrix and solve using Gaussian elimination. x=+2y+z=3 2y+3z =2 -x+2z = 1

68. ## Math

Use elimination to solve each system of equations. x+y-2z=10 8x-9y-z=5 3x+4y+2z=-10 I need to figure out what x,y, and z each equal. I must use the elimination method.

69. ## algebra 1

Use elimination to solve the the system of equations given by 10x-4y=-20 and 10x-5y=35. I can't figure this one out. Whenever I check my work, it is incorrect.

70. ## Math

I cannot come up with the right answers for my matrix. I need to write as a system of equation and solve the system. 1 2 3 x 1 1 1 1 y = 12 -1 1 2 z 2 The answers I come up with are 31 15 15 when I check these, they will not work, what I am doing wrong?

71. ## Math

1) x+2y=7, 2x-y=4 What I did: multiply 2x-y=4 by -2 so I could eliminate the y variable. -4x-2y = -8 + x +2y =7 = -3x =-1 Divided -1 by =1 and got x=1/3 I only need someone to check my answer. Also one last question, can I use the elimination method for

72. ## Algebra 2

Can someone check my answers. Write the following equations in standard form. 1) x^2 - 2x + y^2 + 4y = 11 answer: (x-1)^2 + (y+2)^2 = 16 2) 4x^2 + 24x - y + 34 = 0 answer: y = 4(x-3)^2 + 2 3) The graph of which equation is a circle? A. 5x^2 + 10x = 9 +

73. ## Algebra

Solving system of linear equations by using the apropiate method name the method and the x,y coordinates 1)X=4y+8 2x-8y=-3 2)3x-7y=6 elimination method 2x+7y=4 (2,0) 3)5x-2y=12 elimination method 3x-2y=-2 (7,23/2) 4)9x-8y=42 elimination method 4x+8y=-16

74. ## math pre calc

gaussian elimination x+Y+Z=-2 X-y+5z+22 5x+y+z=-22

75. ## algebr7a

can anyone tell me how to use Gaussian Elimination? 3x+2y+4z=19 x+5y+2z=1

76. ## quantitative techniques

solve this using gaussian elimination x+5y=7 -x-7y=-5

77. ## algebra

2x+8y-8z-22 x+2y-2z=3 5x+7y+z=-13 solve by gaussian elimination

1. Solve the system of equations by elimination.y=2x^2-2x-3 and y=-x^2-2x-3 2.The system of equations y=-5(x+4)^2-4 and y=8x^2+64x+124 has _____ solution(s). 3. Determine the value of k in y=kx^2-5x+2 that will result in the intersection of the line

79. ## Matrices

Gaussian row elimination method: (i) x+3y+z=4 x-2y-2z=3 2x+y-z=9 (ii) x+2z+y=0 2x+y+z=6 3x+3y+2z=14

80. ## Algebra 2

1.) Write a system of equations that has NO solution. 2.) If you wanted to eliminate the y variables in the system of equations below, what would you multiply the first and second equations by?( Do not solve the equation) 2x-3y=8 7x-4y=11

81. ## Algebra 2

1.) Write a system of equations that has NO solution. 2.) If you wanted to eliminate the y variables in the system of equations below, what would you multiply the first and second equations by?( Do not solve the equation) 2x-3y=8 7x-4y=11

82. ## Calculus

Please check my answers. Solve the following equations and/or system of equations for the unknown variables. 1. x^2-3x-12=0 x= 3 + sqrt(57) / 2, x= 3 - sqrt(57) / 2 2. x+y=8 , 3x+2y=2 x=-14, y=22 3. 3x + 2y =10 , x+y=5 , y+z =9 x=0,y=5, z=4 4. 1/x-p1z=0,

83. ## algebra

SOVING SYSTEM OR EQUATIONS BY ELIMINATION

84. ## Math

Use elimination to solve the system of equations. -x + 2y = 18 x + 8y = -38

85. ## Algerbra1

Use elimination to solve each system of equations: s-t=4 over s+t=2; -4x+2y=8 over 4x-3y=-10

86. ## maths

Mere, Sam and Nathan go to a bookshop to buy supplies for their school. Mere bought two erasers and four pencils and paid \$2.40 for it. Sam bought six erasers, one pencil and two pens and paid \$3.95 while Nathan paid \$4.15 for an eraser, a pencil and four

87. ## MATH HELP

I posted this yesterday and no one bothered to check it, therefore Im posting it again, please check it this time. The south edmonton pet shop has several parrots and dogs for sale. There are a total of 24 heads and 82 legs in the display cages. A) Write a

88. ## Algebra

Checking a few answers to some algebra problems: 1.Find the slope of the line that passes through the points (-4,1) and (3,5). I got m = 5-1 / 3-(4) Answer is m = 4/7 2.Find the equation, in slope-intercept form, of the line that passes through the points

89. ## algebra 1

Got a test tomorrow... Say you have a system of equations (linear), that you can solve using substitution, graphing, or elimination. Without solving the equations, can you tell if there is one solution, many solutions, or no solution?

90. ## Algebra

I have two equations that I need to solve using the elimination method the system is x = y = 9 and 2x - y = -3

91. ## algebra

How to solve the system of equations below using elimination? b = 2a+1 10a+b=5b+2

92. ## math

Solve the system of equations by elimination. (2 marks) y=2x^2-2x-3 y=-x^2-2x-3

93. ## Algebra

How do you solve a system of equations by substitution and/or elimination?

94. ## English

You are going to take a quiz. I'll distribute exam papers. You should write down the answers. Fill in the blanks with suitable expressions. Take one and pass the others to the other students. First write down your number and name on the top of the paper.

95. ## Math

Solve the system of linear equations by elimination. Thank You for your help. 8x+10y=3 3x-5y=2

96. ## math

Solve following system of equations? x+3z=-2 2x+2y+z=4 3x+y-2z=5 i need help with few so i can get hang of this math plz. Perform row operations write new matrix [132 -312 2-11| 073] R1+R2 using x,yand z variables write system linear equations represented

solve the following system or linear equations by elimination. verify your solution 1. -4 - 9y = 9. 2.x - 3y = -6

98. ## Math Check

Hi! Can someone check this for me? My teacher wants me to write the system of equations that will correspond to the final matrix. I have the matrix already, but I need help with the writing the system stuff. Thanks! Matrix: [-10 2 | 48] [-5 -6/4 |-9] My

99. ## Math

Ues the Gaussian elimination to find complete solution to the equation or show that none exist 5x+12y+z=10 2x+5y+2z=-1 x+2y+-3z=5

100. ## quick question regarding equations

I know there are methods out there but what do you think is the best or easiest method(s) of solving a system of equations. Depends on the coefficients of the equation. If in one of the equations I can solve for one of the variables without having to