A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 5 years ago

how do i figure this inequality: 3x-7y>21

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

    Are you solving for y?

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

    i really dont know i think im supposed to find out if the left side of the inequality is greater than the right side

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

    Well it depends on what x and y is. However based on the looks of the problem (and my experience with people who have the same questions), they are probably wanting you to solve for y.

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

    idk my math teacher told me to use the coordinates (0,0)

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

    That would change things slightly (you probably should have wrote that with the problem). If you are using the coordinates (0,0), then you will substitute 0 for x and 0 for y. Then you will have 3(0)-7(0)=0. However, is 0 greater than 21?

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

    no it isnt but problem is my graph only goes to ten

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

    Are you using a graphing calculator? If so which one?

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

    im bnot its a take home test and thats as long as they made the graph i was wondering if there was a way to simplify it

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

    Solve for y. Then you can subtract 3x from both sides of the inequality, so -7y>21-3x. Then divide both sides by -7; however, do you know what happens to the inequality when you divide by a negative sign?

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

    ummmm is it that -7y gets divided by 21-3x which would make the inequality y>-3-(-3/-7) right?

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

    Umm not quite. What I meant to say is, when you divide by a negative sign (-7 in your case), the inequality sign ">" will turn the opposite direction ("<"). You can flip the direction only if you divide by a negative (this is a good thing to know). So your inequality should be y< (21-3x)/(-7)

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

    oh ok i see it now thankyou

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

    Is there any step that did not make sense?

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

    no my math teacher goes to fast in class so i dont get most of it but you made it very clear to me now thankyou

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

    You're welcome!

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

    ok thats all

  17. 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.