Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

malutella

  • 2 years ago

Solve these systems of equations 7x+2y= -3 and -14x-4y=6 . I got y=3/2, x= -6/7 am I right ?

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

    hmm multiply first equation with 2

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

    14x+4y=-6

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

    14x+4y+6=0

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

    well yeah i did that multiplying it by -2 so that when i add it in the second question -14x and 14X cancel out (I'm using linear combinations here)

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

    -14x+4y-6=0

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

    *equation

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

    if thats the case both x and y cancels out!!

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

    isnt it?

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

    In the first equation you do 2y times -2 = -4y. Now in the 2nd equation you have -4y soo -4y+ -4y is -8y which means that the ys don't cancel out

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

    nt really :)

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

    infact both these lines are the same !!

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

    take a look at the graph

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

    http://www.wolframalpha.com/input/?i=solve+7x%2B2y%3D+-3++and+-14x-4y%3D6

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

    yes I see...so there's something I'm doing wrong in my math here !

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

    u were right they are the same line!

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

    take a look at the question you have posted !!

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

    :P yep makes sure u type the qns right :)

  18. 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.