Algebra

posted by .

4x+2y-3z=7 2x+4y+z=35 6x+2y-2z=20 solve the system

  • Algebra -

    #1 + 3(#2) ----> 10x + 14y = 112 or 5x + 7y = 56 (#4)
    #3 + 2(#2) ---> 10x + 10y = 90 or 5x + 5y = 45 (#5)

    #4 - #5 ---> 2y = 11
    y = 5.5
    in #5 --> x + 5.5 = 9
    x = 3.5

    in #2
    2(3.5) + 4(5.5) + z = 35
    z = 6


    I will leave it up to you to check those answers.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. College Algebra

    Solve the system of equations using matrices. If system has no solution say its inconsistent. 6x + y = 5 3x - y + z - w = 8 z + w = 2 Solve the system of equations using Cramers Rule if applicable. 4x + 2y = 8/5 5x - 5y = 5
  2. College Algebra

    Solve the system of equations. Then classify the system. 7x-7y= -42 -7y-7x=42 What is the solution of the system?
  3. 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 …
  4. math

    Please explain in detail how to solve each question: At a certain high school, 350 students are taking an algebra course. The ratio of boys to girls taking algebra is 33:37. How many more girls are taking algebra than boys?
  5. algebra 2

    Nonlinear homework... Solve the system by elimination. 1)y=x^2+2 -4x-y=10 2) Solve the system using substitution. Y=-3x^2+x-2 Y=-5x+3
  6. algebra 2

    Nonlinear systems Solve the system by elimination. y=x^2+2 -4x-y=10 Solve the system using substitution. y=-3x^2+x-2 y=-5x+3
  7. Algebra

    I need help I don't know how to solve this system Solve the following system. Show all your work 3x-2y+2z= 30 -x+3y-4z= -33 2x-4y+3z= 42
  8. Algebra, help needed

    I need help I don't know how to solve this system Solve the following system. Show all your work 3x-2y+2z= 30 -x+3y-4z= -33 2x-4y+3z= 42
  9. Algebra

    7x + 5 = y 3.5x + 20 = y Solve the system of equations. What method did you use to solve the system and why?
  10. Algebra Help

    1. Verify that (-4, 12) is the solution to the system. Show work to justify your answer 2x+y=5 -5x-2y=-6 2. Solve the system by graphing. State the solution. x + y =2 2y – x = 10 3. Solve the system by substitution. State whether …

More Similar Questions