A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

Can some explains this to meh. please?

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

    Look at these sets of ordered pairs. W) {(8, 9), (2, 3), (0, -2), (10, -9)} X) {(0, 0), (5, 10), (-3, 3)} Y) {(1, 1), (2, 2), (3, 3), (4, 4)} Z) {(-10, 1), (-9, 3), (-4, 5)} Which of the sets represent functions?

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

    W is a function because each of the x values (first values in each pair) has a different value of y associated with it

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

    Z is also a function for the same reason

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

    so what you are saying is that w and z are functions because x and y do not have the same values

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

    Y maps on to itself - not sure but i think a function can do that.

  6. misty1212
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    hmmm

  7. misty1212
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    i hate to disgree with @welshfella but this is what you need to look at: if all the x values are distinct (all different) then it IS a function if there are repeated x values (some are the same) then it is NOT a function

  8. misty1212
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    ignore the y values completely they have nothing whatsoever to do with it

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

    no a relation is a function if each value of x only maps on to a single value of y so a function can be one-to-one or many=to-one but it cant be one-to-many

  10. misty1212
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \[W) \{(\color{red}8, 9), (\color{red}2, 3), (\color{red}0, -2), (\color{red}{10}, -9)\}\]

  11. misty1212
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    all x's are different, it IS a function

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

    so {(3,1) (2,3) is a function but {(3,1) (3,4) is not a function (as its one-to-many)

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

    so which values do i compare to tell if one value is a function itself

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

    This is not my expertise but aren't they all functions?

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

    so W,Y, and Z are the functions or is it all of them

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

    yes you are right misty - my error

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

    I think all of them are

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

    I am sorry i am confused which ones are the functions and which ones are not?

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

    all are

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

    okay thank you @welshfella and thank you as well @misty1212

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

    just check out the x values as misty said - they are all different in each function

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

    I have trouble with functions on times.....

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

    - you can have repetition of y values but not of x values so { (1,2), (2,2) } for example is a function because its many-to-one

  24. 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.