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freemap

  • one year ago

Last week, Hazel paid $32 to have 50 reports printed. This week, she paid $57 to have 100 reports printed. Assume the relationship is linear. Which equation models the relationship between the number of reports, x, and the cost, y? A. y=2x+68 B. y=1/2x +7 C. y=1/2x+24 D. y=2x +34

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  1. freemap
    • one year ago
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    How do I solve this?

  2. Vocaloid
    • one year ago
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    x = number of reports y = cost using the information in the problem, we can write two points (32,50) and (57,100) then you can write an equation for the line that goes through these points

  3. freemap
    • one year ago
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    ok, can you stay while I solve it

  4. Vocaloid
    • one year ago
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    sure

  5. Vocaloid
    • one year ago
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    one more time: (50,32) and (100,57)

  6. freemap
    • one year ago
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    lol ok

  7. freemap
    • one year ago
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    If you use slope, its .418

  8. Vocaloid
    • one year ago
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    you sure? (50,32) and (100,57) slope = (y2-y1)/(x2-x1)

  9. Vocaloid
    • one year ago
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    (57-32)/(100-25) = ?

  10. freemap
    • one year ago
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    ok wow I did that wrong, sorry

  11. freemap
    • one year ago
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    -7/43= -.1627

  12. Vocaloid
    • one year ago
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    still not right

  13. Vocaloid
    • one year ago
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    57-32 = ?

  14. freemap
    • one year ago
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    25

  15. Vocaloid
    • one year ago
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    100-50 = ?

  16. freemap
    • one year ago
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    oh, i thought i had to use slope

  17. Vocaloid
    • one year ago
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    we are using slope

  18. Vocaloid
    • one year ago
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    (57-32)/(100-50) = ?

  19. freemap
    • one year ago
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    25/50 =.5=1/2

  20. Vocaloid
    • one year ago
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    good, so our slope is 1/2 know how to finish from here?

  21. freemap
    • one year ago
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    I have no clue how to finish

  22. freemap
    • one year ago
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    please help me out

  23. freemap
    • one year ago
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    B or C

  24. Vocaloid
    • one year ago
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    use the point-slope equation y-y1 = m(x-x1) where (x1,y1) = one of the points (either one, take your pick) and m = slope

  25. freemap
    • one year ago
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    OK, just a sec

  26. freemap
    • one year ago
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    y-32=1/2(x-50)

  27. freemap
    • one year ago
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    32+-50 is 18

  28. freemap
    • one year ago
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    oh wait do I have to multiply 1/2 times -50

  29. freemap
    • one year ago
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    Please help

  30. freemap
    • one year ago
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    @ganeshie8

  31. freemap
    • one year ago
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    B or C

  32. Vocaloid
    • one year ago
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    y-32=1/2(x-50) start by distributing the 1/2

  33. freemap
    • one year ago
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    I got 7 so the answer is B, forgot to distribute. Thanks so much, real hero

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