Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

pau08

  • 2 years ago

please answer this: How will you determine the equation of the line if the given are two points of the line? i really need the answer... thank you

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

    first find the slope, m=(y2-y1)/(x2-x1)

  2. ChrisV
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    then write it in slope intercept form y-y1=m(x-x1)

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

    What if I make up two points and work the problem I made up? Will that help?

  4. pau08
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    okey....

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

    Points ( 2, -1 ) and ( -4, -5 ) lie on a line. Find the equation of the line that contains then. Leave your answer in y = mx + b form.

  6. Directrix
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    First, get the slope. Think of slope as change in y over change in x. m designates the slope of a line and has formula [y2 - y1] / x2 - x 1 ] . The y2 is not y^2 but what we call y sub 2 because the 2 is a subscript which is hard to type.

  7. Directrix
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    One of our points will be (x1, y1) and the other (x2, y2) It does not matter which is which.

  8. Directrix
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    Let (x1,y1) be (2, -1) and let (x2, y2) be (-4, -5) Questions so far?

  9. pau08
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    what is y=mx+b

  10. Directrix
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    That is the form we will leave the equation of our line in. So, if we get something like 2x + 7y = 2/3, then that's not y = mx+b form.

  11. pau08
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ah okey

  12. Directrix
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    You don't have to leave the equation in that form unless instructed to do so. Most books do request that or standard form.

  13. Directrix
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    Focus on cranking out this slope right now.

  14. pau08
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    okey

  15. Directrix
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    |dw:1329213587734:dw|

  16. Directrix
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    4/6 = 2/3 so the slope m is 2/3. Note the use of grouping symbols to help prevent sign problems or "sinus" problems as I call them. :)

  17. Directrix
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    Do you follow how the slope came to be 2/3?

  18. pau08
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ah okey

  19. pau08
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes

  20. pau08
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    you simplify it

  21. pau08
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1329268007717:dw|

  22. Directrix
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    Yes.

  23. Directrix
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    Hey, I like "okey." I understand it means "yes."

  24. Directrix
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    Okey, now we use the point slope formula to get the equation of the line.

  25. Directrix
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    y - y1 = m (x - x1) y - y1 = (2/3) ( x - x1)

  26. pau08
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    okey can i solve it?

  27. Directrix
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    (x1,y1) be (2, -1) from above. y - (-1) = (2/3) ( x - 2)

  28. pau08
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    oh, i change my mind i don't want to answer it

  29. Directrix
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    We're almost finished. I'll finish if you have to go.

  30. pau08
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i'll have to go now eh... can we finish it now??

  31. Directrix
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    y - (-1) = (2/3) ( x - 2) y + 1 = 2/3 (x - 2) multiply both sides by 3 3(y + 1) = (3) (2/3) (x-2)

  32. Directrix
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    3y +3 = 2 (x-2) 3y + 3 = 2x - 4

  33. pau08
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    transpose it, right?

  34. Directrix
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    Yes, thought you left, :) 3y = 2x - 7

  35. pau08
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so the answer id -2x+3y=-4-3

  36. pau08
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    the final answer is 2x-3y=7

  37. Directrix
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    y = (2/3) x - 7/3 in y = mx + b form where m is the slope and (-7/3) is the y-intercept.

  38. Directrix
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    Look at the cool graph: http://www.wolframalpha.com/input/?i=line+%282%2C-1%29+and+%28-4%2C-5%29+

  39. Directrix
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    One last word. There is no quick and short way to learn math but once you do learn it, you will be proud of yourself.

  40. Directrix
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    Just takes practice like anything else. :)

  41. pau08
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    haha....thanks for your help.......what is the answer?

  42. Directrix
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    y = (2/3) x - 7/3

  43. pau08
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ah...........T.Y.P

  44. Directrix
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    Glad to help.

  45. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

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.