Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

bridgetolivares

  • 2 years ago

Part 1: Explain, in complete sentences, which method you would use to solve the following system of equations. (1 point) Part 2: Explain why you chose that method (1 point) Part 3: Provide the solution to the system. (2 points) x – 2y + z = 0 2x – 3y – 4z = –9 x + 2y – 5z = 0

  • This Question is Closed
  1. bridgetolivares
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    If anyone can just explain to me how to solve it, i would really appreciate it.

  2. kennethreynold8
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Set up a 3 by 4 matrix. The first row should be: 1 -2 1 0 Keep this row the same. We will use the 1 in the first space to eliminate the others in the first column. Multiply row 1 by -2. The result is: -2 4 -2 0. Add this to row 2. Row 2 now becomes: 0 1 -6 -9. Keep this as row two. Multiply row 1 by -1 and add this to row three. Row 3 now becomes: 0 4 -6 0. Multiply row 2 by -4 and add the result to row 3. Row 3 now becomes: 0 0 18 36. Divide row 3 by 18 and it becomes: 0 0 1 2. This means that z=2. Substitute into row 2: 0 1 -6 -9 and we get 1y -6z=-9 y-6*2=-9 or y-12=-9 or y=3. Substitute in any of the equations(The easiest is row 1 so I'll use x-2y+z=0): x-2(3)+2=0 or x-6+2=0 or x-4=0 or x=4. Final answer: (4, 3, 2)

  3. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.