Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

ErinWeeks

  • 3 years ago

What is the y−coordinate of the y−intercept of the line that passes through the points (−4, −4) and (4, 8)? The only question im stuck on PLEASE HELP! :)

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

    figure out the slope then use y=mx+b and sub the slope for m and use one of the points for (x,y) to solve for b. b is our answer

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

    Is there anyway you could start the equation of for me?

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

    |dw:1358369271960:dw|tell me what the slope is first

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

    the slope would be M right but where am I looking for the slope for with the fraction?

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

    you need the slope to be able to use it in y=mx+b then you can use one of the points I would use (4,8) x=4 y=8 then you are solving for b. b is known as your y intercept and that is what you are looking for

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

    So I have so far y= ? + 8 Would I plug in the 4?

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

    |dw:1358370299889:dw|you need the slope to sub the m value and solve for b

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

    Alright so what operation would I do from here?

  9. Carolin
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    next, u can just substitute the M = gradient = slope into this equations to find value b

  10. Carolin
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    then, rewrite the equation form in y = mx + b

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

    Whats the value for m?

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

    im so confused on what to do I might just guess lbvs...

  13. Carolin
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    m = 3/2

  14. Carolin
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    y = mx + b 8 = (3/2)(4) + b 8 = 6 + b b = 8 -6 = 2 then, rewrite the equation: y = mx + b y = 3/2 x + 2 That the final answer

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

    Oh you times by 4 DURR! Thank you so much I really appreciate it that makes so much more sense! Thank you again :)

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

    so y=3/2x+2 is my answer?

  17. Carolin
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yup :)

  18. Carolin
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    welcome^^

  19. 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