A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 4 years ago

-4-7/4x=10 Solve the following equation. Please show all work! Have done just want a second opinion

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

    what did you get?

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

    x=14

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

    is the problem \[ -4 - \frac{7}{4x} = 10\]

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

    if so, \[-4 - \frac{7}{4\cdot 14}=10\] which does not work. if the problem is \[ -4 - \frac{7}{4}x=10 \] then with x=14 \[ -4 - \frac{7}{4}14=10 \] which also does not work.

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

    I added 4 to both sides

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

    that is a good start. but which problem is it (see above)?

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

    I subtracted the ricp from it too, I guess I just need to start over again

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

    Let's do -4 - (7/4)x = 10 (the x is up top) then add 4 to both sides -(7/4)x= 14 this is what you got, right? to get rid of the -7/4 *multiply* by the reciprocal on both sides of the equation

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

    yes

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

    can you do \[ \frac{-4}{7}\cdot \frac{-7}{4}x= 10\cdot \frac{-4}{7} \]

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

    cant cancel can you since the 4 and 7 are oposit of each other

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

    -4/7*-7/4 =0

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

    You can cancel (that is why we are doing it). the order of multiplication does not matter 2*3= 3*2 so \[ \frac{-4}{7}\cdot\frac{-7}{4} =\frac{-7}{7}\cdot\frac{-4}{4} = -1\cdot -1= 1\]

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

    x=-4/70?

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

    just makes it x

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

    close, but think of the 10* -4/7 as \[ \frac{10}{1}\cdot \frac{-4}{7} \] multiply top times top and bottom times bottom

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

    nice

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

    -4/70

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

    Let's back up: -4 - (7/4)x = 10 then add 4 to both sides -(7/4)x = 14 x = 14 * -4/7 can you finish this?

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

    56/7

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

    what happen to the minus sign?

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

    forgot to put it in

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

    -56/7

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

    OK, let's check your answer x= -56/7 you start with -4 - (7/4)x = 10 if x is -56/7 then the left-hand side is -4 - (7/4)*(-56/7) can you do this?

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

    before you forget notice that it is minus times minus so -7/4 * -56/7 is + (cancel the minus signs) also, you can cancel the 7's

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

    14

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

    keep going, you are doing -4 - (7/4)*(-56/7)

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

    you found -7/4 * -56/7 = +14 so now -4 + 14 =

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

    -4(14)=56

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

    -56

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

    look at it more carefully we are adding

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

    18

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

    -4 - (7/4)*(-56/7) --> -4 + 14

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

    4+14= 18 -4 + 14 = ?

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

    when you add negative numbers, it's like subtraction.

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

    -10?

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

    -4 + 14 is the same problem as 14 - 4

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

    Here is a 5 minute video that might help http://www.khanacademy.org/video/adding-negative-numbers?playlist=Developmental+Math+2

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

    Thank you it might I hope so thanks for all of your help

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

    you will get +10 which matches the original -4 - (7/4)x = 10 you figured out that when x= -56/7 that the equation turns into 10 = 10 which means you got the right answer.

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

    With lots of help from you thanks

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

    If the video helps and is not too boring, then search for the videos on solving equations (use his search window). If something does not make sense, search for a video that explains it, because he explains *everything*

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

    Thank you I will look at the links wheather they are boring or not I need the info

  44. 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.