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anonymous

  • one year ago

pic below please help me. @Preetha @Phi

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  1. anonymous
    • one year ago
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    @Lady.Liv1776 @Lilmike234 @mathstudent55 anyone please help

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  2. phi
    • one year ago
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    y-intercept is where the line crosses the y-axis (the vertical axis) any idea where the line crosses the y-axis?

  3. anonymous
    • one year ago
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    about 3

  4. phi
    • one year ago
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    yes. so 3 matches after how much practice ?

  5. anonymous
    • one year ago
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    0 practice

  6. phi
    • one year ago
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    so that is the answer to part A (if you make that into a coherent thought)

  7. phi
    • one year ago
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    if they don't practice, we expect them to win only about 3 matches.

  8. phi
    • one year ago
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    for part B you want y = mx + b we need m and b from part A we know b to find m (the slope) look at x=4 (get its y value) and at x= 7 (ditto) what two points do you read off the line?

  9. anonymous
    • one year ago
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    10 and 16

  10. phi
    • one year ago
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    ok, those are the y values. you want to write the two points as (4,10) and (7,16) now find the slope which is change in y divided by change in x can you do that ?

  11. anonymous
    • one year ago
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    is it 1/2

  12. phi
    • one year ago
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    what is the change in y ?

  13. phi
    • one year ago
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    in other words, what is 16- 10 ?

  14. anonymous
    • one year ago
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    3?

  15. phi
    • one year ago
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    remember y is the 2nd number in each pair (or the height of the point above the x-axis) change in x is 7-4 = 3 so the slope is 6/3 = 2 ok?

  16. phi
    • one year ago
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    your equation is y= 2x+3

  17. anonymous
    • one year ago
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    ok that makes sense. sorry if I seemed dumb there I just didn't remember that y is the second number in each pair

  18. phi
    • one year ago
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    the last part is to "put in" 13 for x in the equation and then calculate y

  19. phi
    • one year ago
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    did you do y = 2*13+3 ? for the last part. you get 29 matches

  20. anonymous
    • one year ago
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    yes I did do that. thank you soooo much @phi i really appreciate it..

  21. phi
    • one year ago
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    for part B, they ask what the number of matches you will win if you practice 13 months that is why we use x=13

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