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anonymous

  • one year ago

A proportional relationship between the number of pounds of potatoes (x) and the price in dollars (y) is graphed, and the ordered pair (4, 3) is on the graphed line. Part A: What is the price of 1 pound of potatoes? Show your work, including the proportion you used to determine the price. (8 points) Part B: What does the ordered pair (8, 6) on the graph represent? Explain in words.

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  1. anonymous
    • one year ago
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    okay, so we know the equation y=mx+b

  2. anonymous
    • one year ago
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    yea

  3. anonymous
    • one year ago
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    but first

  4. anonymous
    • one year ago
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    we have to plug in (4,3) into that equation

  5. anonymous
    • one year ago
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    ok

  6. anonymous
    • one year ago
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    so that you can find b, right?

  7. anonymous
    • one year ago
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    and then, from there you can draw a line and find out how much it would cost for 1

  8. anonymous
    • one year ago
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    Ok can u stay to check my work?

  9. anonymous
    • one year ago
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    totally

  10. anonymous
    • one year ago
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    ill have some work too and ill snap a pic

  11. anonymous
    • one year ago
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    wait can you help me draw the graph?

  12. anonymous
    • one year ago
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    what do you mean? like the line?

  13. anonymous
    • one year ago
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    Yea like how would it be presented?

  14. anonymous
    • one year ago
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    okay so since we dont have a slope

  15. anonymous
    • one year ago
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    we know that slope is the change in y over the change in x

  16. anonymous
    • one year ago
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    Yea

  17. anonymous
    • one year ago
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    so we have 3=4m+b

  18. anonymous
    • one year ago
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    but we cant solve yet since we have two variables

  19. anonymous
    • one year ago
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    ok ok

  20. anonymous
    • one year ago
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    so we can do 3/4 as the slope using the given point right?

  21. anonymous
    • one year ago
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    so now we have

  22. anonymous
    • one year ago
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    \[3=\frac{ 3 }{ 4 }\times 4+b\]

  23. anonymous
    • one year ago
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    ok ok

  24. anonymous
    • one year ago
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    so what do we get when we solve that equation?

  25. anonymous
    • one year ago
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    3?

  26. anonymous
    • one year ago
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    or 0..

  27. anonymous
    • one year ago
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    well, 3/4 times 4 equals three

  28. anonymous
    • one year ago
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    correct

  29. anonymous
    • one year ago
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    its zero

  30. anonymous
    • one year ago
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    so the y intercept is zero

  31. anonymous
    • one year ago
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    yay

  32. anonymous
    • one year ago
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    so now

  33. anonymous
    • one year ago
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    we have the equation y=3/4x+0

  34. anonymous
    • one year ago
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    so we just plug in one for x

  35. anonymous
    • one year ago
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    and we get y is equal to 3/4

  36. anonymous
    • one year ago
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    ok

  37. anonymous
    • one year ago
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    |dw:1439846550731:dw|

  38. anonymous
    • one year ago
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    so now all i need to do is plug it i right?

  39. anonymous
    • one year ago
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    just graph for you to visualize

  40. anonymous
    • one year ago
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    yup

  41. anonymous
    • one year ago
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    and then part b, means 8 pounds for 6 dollars

  42. anonymous
    • one year ago
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    ok thank you :) :) :)

  43. anonymous
    • one year ago
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    ok

  44. anonymous
    • one year ago
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    your welcome! just tag if you need help again :)

  45. anonymous
    • one year ago
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    ok :)

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