Quantcast

A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

mariannu

  • 2 years ago

Solve the linear system using elimination. Hello you guys. I just want to know how you flip it. 2x - y= -11 y = -2x -13

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

    rewrite the second equation by adding 2x to both sides.

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

    for the second equation \[y=-2x-13\] you already solved for y. plug that y into the first equation, giving you\[2x-(-2x-13)=-11\]

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

    Don't get it.

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

    :p

  5. Mertsj
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    So chrismoon, you are instructing the asker to ignore the directions which say to solve using elimination?????

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

    ALl I just want to know is just how to flip it. and thats it.

  7. Mertsj
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    @mariannu Do what I said and then add the two equations to eliminate y from the system

  8. Mertsj
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    What do you mean by flip it?

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

    So its y + 2x = -11???

  10. Mertsj
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1361938190124:dw|

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

    Ok that makes more sense thank you! ^.^ for the help. So I just do that for other equations like that right?

  12. Mertsj
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Do you mean other systems?

  13. Mertsj
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    If so, the answer is yes.

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

    Ok, thank you much!!! ^.^ lol

  15. Mertsj
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yw

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

    You're given two things: Equation 1)\[2x-y=-11\]Equation 2) \[y=-2x-13\] Equation 2 tells you what y is already. You can put what y equals (-2x-13 in this case) into the first equation for y. Equation 1 goes from \[2x-y=-11\] to \[2x-(-2x-13)=-11\] since\[y=-2x-13\] Simplify your Equation 1 from \[2x-(-2x-13)=-11\] to \[2x+2x+13=-11\]giving you \[4x=-24\] divide both sides by 4 to solve for x \[x=-6\] Now that you have solved for x, go all the way back to the original Equation 2\[y=-2x-13\] Since we know what x is now, plug it in\[y=-2(-6)-13\]giving us \[y=-1\] There you have it: \[y=-1\]and \[x=-6\]

  17. Mertsj
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    @chrismoon Why do you keep telling the asker to ignore the directions given?

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

    Sorry, didn't see you guys already talked about it before I posted. Didn't get notified you guys got it taken care of.

  19. Mertsj
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    @chrismoon The problem says to solve by elimination. You keep telling the asker to use substitution.

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

    Guess I didn't read the question very thoroughly. My bad.

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

    That is ok. As you try to help. but thanks

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

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

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.