Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

alainabbyboo22 Group Title

Which equation has this graph?

  • 2 years ago
  • 2 years ago

  • This Question is Closed
  1. alainabbyboo22 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    • 2 years ago
    1 Attachment
  2. alainabbyboo22 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Answer choices available: A. y = x2 - 6x + 5 B. y = -x2 - 6x + 5 C. y = -x2 - 6x - 5 D. y = x2 + 6x - 5

    • 2 years ago
  3. heisenberg Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    You said you tried plugging in some points from the graph in these equations? What points did you choose?

    • 2 years ago
  4. alainabbyboo22 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Oh that was for a different equation. This one is a new one.

    • 2 years ago
  5. heisenberg Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    Ah, well same method should work. There are two points that are very easy to spot here: the "zeros" of the graph: (1,0) and (5,0) do you see that?

    • 2 years ago
  6. alainabbyboo22 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Not exactly.. :/ I don't get this one.

    • 2 years ago
  7. heisenberg Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    So can you tell me any point on that graph? A point is an x and y coordinate.

    • 2 years ago
  8. alainabbyboo22 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    1 and 3? I don't know. :(

    • 2 years ago
  9. heisenberg Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    A point looks like this: (x, y). These numbers correspond to points on graphs. Do you see how (1,0) lies on that graph? Do you see how (0,0) does not?

    • 2 years ago
  10. alainabbyboo22 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Yeah I suppose.

    • 2 years ago
  11. heisenberg Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    |dw:1327095609111:dw| like that^

    • 2 years ago
  12. alainabbyboo22 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Alright, then what's next?

    • 2 years ago
  13. heisenberg Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    The graph "passes through" (1,0) but not (0,0)

    • 2 years ago
  14. heisenberg Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    So we know (1,0) is a point on this graph. So let's try and plug x = 1 and y = 0 into those 4 choices and see which one works.

    • 2 years ago
  15. heisenberg Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    A. y = x2 - 6x + 5 B. y = -x2 - 6x + 5 C. y = -x2 - 6x - 5 D. y = x2 + 6x - 5 Can you plug x = 1 and y = 0 into any of these?

    • 2 years ago
  16. heisenberg Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    I'll do the first one for you: y = x^2 - 6x + 5 if x = 1, and y = 0 we get: 0 = (1)^2 - 6(1) + 5 0 = 1 - 6 + 5 0 = -5 + 5 0 = 0 So this is true for equation A. Equation A is a possible answer.

    • 2 years ago
  17. heisenberg Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    Are you stuck/confused?

    • 2 years ago
  18. alainabbyboo22 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Hold on I'm trying to figure them out.

    • 2 years ago
  19. heisenberg Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    !!! Nice :)

    • 2 years ago
  20. alainabbyboo22 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    For the B, I solved the equation and got the answer 6. Where do I go from there for B?

    • 2 years ago
  21. heisenberg Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    You should have gotten an equation for equation B: something like: ? = ?

    • 2 years ago
  22. heisenberg Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    not just a single number, but an equation.

    • 2 years ago
  23. alainabbyboo22 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Well I'm saying where do I go after I solve for that? To get to ?=?

    • 2 years ago
  24. heisenberg Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    So let's take a look at B: y = - x^2 - 6x + 5 if x = 1, y = 0, plug them in the equation: 0 = - (1^2) - 6(1) + 5 0 = -1 - 6 + 5 0 = -2 but this is not true! 0 does not equal -2, do you agree?

    • 2 years ago
  25. alainabbyboo22 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    I agree! So basically, once I have plugged in everything, I get rid of the x's and just put those together and I will find out what 0 equals?

    • 2 years ago
  26. alainabbyboo22 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    A will be my answer because that is the only one that equals 0!

    • 2 years ago
  27. heisenberg Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    You want to find the equation where the points (x=1,y=0) and also (x=5,y=0) satisfy the equation.

    • 2 years ago
  28. heisenberg Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    I think A is right as well!

    • 2 years ago
  29. alainabbyboo22 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Thank you heisenberg! :)

    • 2 years ago
  30. heisenberg Group Title
    Best Response
    You've already chosen the best response.
    Medals 3

    Np :). Hope you understood it a little bit. Basically, this was our process: 1. Find a point that lies on the graph 2. Check each equation to see if this point's x and y result in a *true* equation. Good luck :)

    • 2 years ago
  31. alainabbyboo22 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Thanks!! :)

    • 2 years ago
    • Attachments:

See more questions >>>

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.