Quantcast

A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

Matt71

  • 2 years ago

<Simultaneous equation> y=2-x, x(x+y)=5-3y^2 a solution would be helpful please, no idea how these things are solved

  • This Question is Closed
  1. Helper93
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    You know that y=2-x, so plug in 2-x instead of y in the second equation and solve.

  2. Matt71
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Hold on, lemme try

  3. Matt71
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    What's (2-x)^2? Is it the long answer or like, the one with 2 numbers?

  4. Matt71
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    can't do it man, help me out here

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

    If y = 2-x, then x = 2-y. Replace each x with 2-y

  6. Matt71
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    where do I go from 2-2y=5-3y^2?

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

    Put it in the standard form for a quadratic equation and then solve by factoring (if it will factor) or by the quadratic formula if it will not.

  8. Matt71
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    English man, English

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

    Rearrange the equation so that it is equal to 0. Make the y^2 term positive.

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

    Also, it should be 4-2y not 2-2y

  11. Matt71
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Oh

  12. Helper93
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Actually, Mertsj is right, it's easier to replace x other than y.

  13. Matt71
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Eh?

  14. Matt71
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    could one of you dudes just give me the answer +solution? It's REALLY late

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

    \[(2-y)(2-y+y)=5-3y^2\] \[(2-y)(2)=5-3y^2\] \[4-2y=5-3y^2\] \[3y^2-2y-1=0\] \[(3y+1)(y-1)=0\]

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

    Can you solve that for y?

  17. Matt71
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    waaaait

  18. Matt71
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    how did 3y^2-2y-1=0 become (3y+1)(y-1)=0 ?

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

    By factoring.

  20. Matt71
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    what method?

  21. Helper93
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    You can also use discriminant if you want.

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

    Too many cooks.

  23. Matt71
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    mmm, well

  24. Matt71
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    thanks dudes, I'll try to figure this dang thing out

  25. Matt71
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Sorry Helper Can't give more than one medal

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

    • Attachments:

Ask your own question

Sign Up
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.