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

anonnnn Group Title

Help? Explain? 3x - 9y = 3 6x - 3y = -24

  • 2 years ago
  • 2 years ago

  • This Question is Closed
  1. sgta101 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    These are linear equations what did you want to do with them?

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

    It's a system, I have to solve them but I can't figure out how to do it.

    • 2 years ago
  3. yummydum Group Title
    Best Response
    You've already chosen the best response.
    Medals 4

    you can solve using elimination: multiply the first equation by 2 to eliminate the x's:\[~~~~~2~(3x-9y=3)~~~~~~\implies~~~~~~~~6x-18y=6\]\[\underline{-~(6x-3y=-24)}~~~~~\implies~~-\underline{(6x-3y=-24)}\]\[~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~0-15y=30\]now solve for y:\[-15y=30\]divide by -15:\[y=-2\] knowing the value of y we could now use substitution to solve for x: pick either of the two equations and plug in the value of y\[3x-9(-2)=3\]distribute:\[3x+18=3\]subtract 18:\[3x=-15\]divide by 3:\[x=-5\] so: \(x=-5\) and \(y=-2\) hope this helps! :)

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

    So much! You helped me understand it better too, thank you so much!

    • 2 years ago
  5. yummydum Group Title
    Best Response
    You've already chosen the best response.
    Medals 4

    No problem, anytime! :)

    • 2 years 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.