A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 5 years ago

Solve the system x - y = 3 and 3x - 8y = 9. What is the value of y?

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

    Answer choices available: A. 3 B. 0 C. 6 D. -2

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

    From the first equation, we can rearrange to get x: x - y = 3 x = y + 3 Plug this into the second equation and we get: 3(y + 3) + 8y = 9 3y + 9 + 8y = 9 11y = 0 y = 0 Then substitute y back in the original equation: x - y = 3 x - 0 = 3 x = 3 A is your answer.

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

    Thank you SirSushii! :)

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

    What is the value of y? 3 times the first equation subtract the second gives 3x - 3y = 9 and 3x - 8y = 9 Subtracting, 5y=0 => y=0 B is the answer for y.

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

    Oops. My bad. xD

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

    :)

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

    Oh dang! Well, it is the thought that counts! :) Thanks mathmate, and I still thank you SirSushii for trying to help me! Thanks both of you! :)

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

    You're welcome! :)

  9. 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.