Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

sonja_lee2

  • 2 years ago

what is the solution of the system equation? -2x+y=3 8x-4y=-12

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

    First solve for y in the first equation

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

    Can you do it?

  3. sonja_lee2
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yeah its y=-2x+3

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

    Watch your negative sign

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

    Do you want to use elimination method or substitution method to solve this problem?

  6. sonja_lee2
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    substitution

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

    Okay, retry to solve the first equation for y.

  8. sonja_lee2
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    idk cause thats how i thought u do it

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

    -2x + y = 3 +2x -2x + y = 3 + 2x y = 3 + 2x

  10. sonja_lee2
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    are u sure??

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

    You have to reverse the sign

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

    yes

  13. sonja_lee2
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    okay nvm i see how u did it

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

    now we will substitute this into the second equation

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

    8x - 4(3 + 2x) = -12

  16. sonja_lee2
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok

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

    can you solve for x by yourself now?

  18. sonja_lee2
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i got 0

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

    There is something wrong. Double check your problem and make sure you typed the original correctly 8x - 12 - 8x = -12 0=0 The x term drops out completely, this shouldn't happen

  20. sonja_lee2
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yeah i guess so thats why i ased cause i was getting confused

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

    I want to go back to this equation 8x - 12 - 8x = -12 rewritten as 8x - 12 = 8x - 12 lets get rid of the -12 8x = 8x then the 8's x=x So we can see that x equals all real numbers

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

    This question is written badly. You are positive this is the correct question?

  23. sonja_lee2
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes

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

    I'm going to admit that I am confused as to our answer as well. Because x can equal anything which gives us an infinite amount of solutions. x=y/2 - 3/2 8(y/2 - 3/2) - 4y = -12 4y -12 - 4y = -12 y can be anything as well I'd say there is any infinite amount of solutions

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

    This is a weird problem. Sry that I couln't help get an exact answer. All of our steps our correct, we didn't make any mistakes

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

    Search OpenStudy
    • 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.