A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

solve 3/4 x -7 = 8 11.25 20 4/3 3/4

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

    @Kitty449

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

    Okay, instead of just giving you the answer, I can help you understand how to do it if you're willing to take the five or so minutes it will take.

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

    20

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

    its better if you tun the fraction into a decimal first. so it 0.75x-7=8 then you do the same thing we did in the last one.

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

    ok thanks. :D

  6. whpalmer4
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    @kitty449 strongly disagree that you should turn fractions into decimals! What if you have a repeating decimal? What if I gave you a problem with \(1/97\) as a fraction? Even if you are going to write it with repeating decimal notation, there are 96 digits in the repeating portion! Also, converting to a decimal makes it more difficult to spot possible cancellations and factors. Do you recognize that 0.00952381... can be factored as \[\frac{1}{3}*\frac{1}{5}*\frac{1}{7}\]I'm guessing probably not. But it isn't hard to work that out from \(\dfrac{1}{105}\) which is the fraction whose decimal expansion starts with that string of digits. Work the problem without decimals: \[\frac{3}{4} x -7 = 8\] Add 7 to both sides: \[\frac{3}{4}x-7+7 = 8+7\]\[\frac{3}{4}x = 15\]Multiply both sides by 4\[4*\frac{3}{4}x = 4*15\]\[3x = 60\]divide both sides by 3\[\frac{3x}{3} = \frac{60}3\]\[x=20\] Checking the answer: \[\frac{3}{4}x-7=8\]substitute our answer\[\frac{3}{4}(20)-7=8\]\[15-7=8\]\[8=8\checkmark\] True statement obtained by putting our answer in original equation, so our answer is correct. No muss, no fuss, no need for any calculating devices.

  7. 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.