Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

mitchelsewbaran

If the 2 lines given by the equations 12x+3y=20 and ax+y=10 don't intersect when graphed, what is the value of "a"?

  • one year ago
  • one year ago

  • This Question is Closed
  1. sasogeek
    Best Response
    You've already chosen the best response.
    Medals 1

    if they don't intersect, it means they're parallel and their gradient is the same. find the gradient of the first equation and that's equal to "a" :)

    • one year ago
  2. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 0

    set both equal to y, and make them have the same slope

    • one year ago
  3. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 0

    as long as they dont have the same y intercept they will not cross if they have the same slope

    • one year ago
  4. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 0

    3y = 20 -3x y = -x-(20/3) and the other equation set to y is what?

    • one year ago
  5. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 0

    @mitchelsewbaran ?

    • one year ago
  6. mitchelsewbaran
    Best Response
    You've already chosen the best response.
    Medals 0

    hmmm.....

    • one year ago
  7. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 0

    that should be +(20/3)

    • one year ago
  8. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 0

    y = -x+(20/3)

    • one year ago
  9. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 0

    solve for y in the second equation

    • one year ago
  10. zzr0ck3r
    Best Response
    You've already chosen the best response.
    Medals 0

    y = -ax+10 we want them to have the same slope so what does a need to be? y = -x+(20/3) y = -ax+10 a = ?

    • one year ago
  11. mitchelsewbaran
    Best Response
    You've already chosen the best response.
    Medals 0

    10?

    • one year ago
  12. sasogeek
    Best Response
    You've already chosen the best response.
    Medals 1

    12x+3y=20 solve for y 3y=-12x+20 y=-4x+(20/3) can u tell what the slope is?

    • one year ago
  13. sasogeek
    Best Response
    You've already chosen the best response.
    Medals 1

    @mitchelsewbaran ... ?

    • one year ago
  14. mitchelsewbaran
    Best Response
    You've already chosen the best response.
    Medals 0

    hold on

    • one year ago
    • Attachments:

See more questions >>>

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.