Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

malutella

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

    hmm multiply first equation with 2

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

    14x+4y=-6

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

    14x+4y+6=0

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

    -14x+4y-6=0

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

    *equation

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

    isnt it?

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

    nt really :)

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

    infact both these lines are the same !!

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

    take a look at the graph

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

    u were right they are the same line!

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

    take a look at the question you have posted !!

  17. AravindG
    • 3 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

Sign Up
Find more explanations on OpenStudy
Privacy Policy