A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

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

    Its A B C D going down from top to bottom. Sorry i couldnt figure and other way to get the pic's

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

    So Swordsman, same reasoning as with your last question. Pick any value x. If it has two values for y, then it isn't function (because you can't give me a definite answer of what f(x) is at that point). If all values of x have unique y values, then it's a function.

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

    I understand That.. its just i dont understand the way the charts are set up. how do i know what the X values are?

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

    So see the line? Pick any part of the line, a point in it. Find the x and y coordinate of that point. That is the (x,y) coordinate there. You cannot have two points on that line with the same x coordinate. Eg (0, 3) and (0,2). If you can find any two points like that, it isn't a function.

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

    Looking at picture B. See when x = 0? What are the y values there?

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

    2 and -2?

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

    Yep, very good. So would that be a function?

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

    no.. Becuase it cant be the same number value?

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

    Exactly, well done! You can't have two identical x values. Now let's look at the first picture A. Can you see if that's a function or not?

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

    so i can say c is wrong too?

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

    That's right, good work.

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

    so its a or d.. on d its just dots.. so does that mean i can cut out d.. and the answer would be a>?

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

    Nope. For d there are only four unique points as you can see. But for part a, there are an infinite number of points (you can imagine how many dots there are joined together to make that line).

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

    d can still be a function, but to prove it's not, you need to find an example where two x values are the same, can you think of any?

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

    -4 and -2?

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

    -2 only has one unique y value (-5), so that wouldn't proof it isn't a function. But you're right about -4, since that has two y values (both -1 and 5). So you've shown it isn't a function, well done.

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

    oh.. on A its the same - and + number so on A B and C it cant be the function.. so that leaves D as the answer! Right?

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

    D isn't a function. But A is. Because in A, you can pick any value x, and there is only one unique value of y. Try it and see if you can find where that isn't true. You shouldn't find anywhere.

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

    *Face Palm* oh noes.. im so blonde!!! THANKS FOR THE HELP!! :D

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

    No problem =)

  21. 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.