A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 4 years ago

3x + 2y= 2 4x + y= -4

  • This Question is Closed
  1. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    multiply second equation by 2

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

    3x+2y=2 8x+2y=-8

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

    subtract second from first

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

    -5x=10 x=-2

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

    y=4

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

    um you did that wrong

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

    let me show you the correct way its called elimination method

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

    oh where's my mistake? i'm not perfect sorry.

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

    3x + 2y= 2 (4x + y= -4)-2

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

    3x + 2y= 2 4x + y= -4 --------- y = -4x - 4 3x + 2(-4x - 4) = 2 3x -8x - 8 = 2 -5x = 10 x = -2 3(-2) + 2y = 2 -6 + 2y = 2 2y = 8 y = 4 (-2,4)

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

    3x+2y=2 -8x-2y=8

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

    -5x=10 x=-2

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

    substitution >>> elimination

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

    you want the y's to cancel

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

    so its times -2 not 2

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

    are you not seeing how we got the same answer. Chris?

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

    the difference is I subtracted the equations. I didn't add them.

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

    slet me show you substitution then

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

    You can do either. You might want to properly educate yourself on the topic before you start calling people out.

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

    3x + 2y= 2 4x + y= -4

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

    wait5 a sec

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

    ill show you

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

    i already did the substitution method juss sayin'

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

    for substitution i would solve one equation for y

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

    hah heated.

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

    before you finish. my answer was x = -2 and y = 4 as shown above. So you are going to tell me that is incorrect?

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

    4x + y= -4 y=-4x-4

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

    substitute that for y in the other equation

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

    4 = -4x-4 8 = -4x x=-2

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

    Chris. just stop.

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

    3x + 2(-4x-4)= 2 3x-8x-8=2 -5x=10 x=-2

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

    Lol

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

    thank you for again proving my point

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

    thats substitution

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

    there was nothing wrong with the elimination method I did. get over it.

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

    you multiplies by 2 instead of -2

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

    it was completely wrong

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

    +2y and +2y do not eliminate

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

    that would give him 4y

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

    I am not saying you were trying to do it wrong, you just made a mistake

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

    ChrisV you can always expand your horizons. Yes you can multiply by -2 then add, But you can just as easily and correctly multiply by +2 and then subtract. The fact that you can eliminate by both adding or subtracting is something you should put in your "solving" tool box.

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

    3x+2y=2 8x+2y=-8 11x+4y=-6 that in know way is right

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

    you can not multiply by 2 and get the right answer there

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

    if you can my friend you have invented a new form of the elimination method

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

    please add it to my precal book so i can inform the aurhors

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

    you have to multiply bu -2 not 2

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

    3x+2y=2 -8x-2y=8 -5x=10 x=-2

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

    You are missing the point: 3x+2y=2 -(8x+2y=-8) ------------ -5x = 10 x=-2

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

    why not call it the subtraction method then? The point is to multiply by a value that eliminates a variable

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

    Just tryinying to sho the simplest way i guess, but yes that comes out correct too

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

    show

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

    anyways lets do something else lol, nothing more to argue about here. Just gonna disagree anyways

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

    Yes that is true, and you may eliminate it either by subtracting or adding depending on your choice of the sign of your multiplier. I am not saying you are wrong and if you wish to restrict your mode of operation to always adding, then have at it.

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

    not adding its called multiplication

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

    lol Chris, maybe when you further your actual understanding of what it means to execute the elimination method then talk to me. Go ask any knowledgeable math teacher or professor you have ever had. I don't appreciate being told that I'm wrong when clearly, I am not. I'm not at all saying what you did was wrong but the fact that you have the inability to realize that the elimination method has multiple execution techniques and then accusing EVERYONE else of being wrong is just disrespectful. I'm sure you are a smart guy but you need to expand your horizon. I have been doing a lot of math for a very long time now. Good luck in the future.

  56. 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.