Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

samyflashy

  • 2 years ago

Solve for y.

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

    |dw:1341889966376:dw|

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

    Cross-multiply.

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

    \[(y-1)(a+b)=(y+1)(a-b)\\(y-1)a+(y-1)b=(y+1)a-(y+1)b\\ay-a+by-b=ay+a-by+1b\\ay-a+by-b-ay-a+by-1b=0\\-2ay-2a+2y-2b=0\]

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

    And it's impossible to solve for y, as there's 3 variable and only 1 equation.

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

    but they gave these 3 choices : A. |dw:1341890553510:dw|

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

    Simply subtract all the terms out that don't contain y, and then factor out the y-term and divide both sides by all the non-y stuff to isolate it.

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

    can u show me?

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

    So here is an example: 2xy+3y-x=0 take out all the non-y terms to try to isolate them by subtracting them from both sides. 2xy+3y=x now factor out the y y(2x+3)=x divide out the non-y stuff! y=x/(2x+3) there you go, that example should help you out!

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

    i dont get it

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

    What don't you get? I can help you but I wont' do your homework for you.

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

    Simply subtract all the terms out that don't contain y, and then factor out the y-term and divide both sides by all the non-y stuff to isolate it. what u said

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

    So basically all you're doing here is trying to get y all by itself, you're solving for y, right? Follow what the guy up there did to get y into an easier form to look like this, −2ay−2a+2y−2b=0 This way you won't have to deal with fractions or anything weird. When you do that, you will notice that some of the terms have a y in them and some don't. So then you can subtract the terms without y in them so they're on the other side. When they're on the other side, you can divide y out. for example if you have y(2x+3) if you multiply that out you get 2xy+3y, so really you're just going backwards to try to extract the y from it.

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

    use the rule if...\[\Large \frac mn = \frac pq\] then ...\[\Large {m+n \over m-n}={p+q \over p -q}\] ...the inverse is also true

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

    or if you are using zepp's equations ... they are only right til the 2nd step \[(y-1)(a+b)=(y+1)(a-b) \]\[\implies a(y-1)+b(y-1)=a(y+1)-b(y+1) \]\[\implies \Large \cancel{ay}-a+by-\cancel b=\cancel{ay}+a-by-\cancel b\] now: bring all the terms with y on one side of the = sign, and all non-y terms to the other\[\implies \Large 2b \cdot y=2a\]\[\Large \implies y= \frac ab\]

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

    This is for Biology group people.Plz go there to have your question answered.d Btw guys your not suppose to answer the question if its in the wrong group. Tell him or her to go to the correct group. Thx ^_^

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

    [(-2a*(a+b))/(a-b-1) =y\]

  17. 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.