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anonymous

  • one year ago

A picture is enlarged by keeping its width the same and increasing its length. The scatter plot below shows the perimeter of the picture (y) for different lengths (x): plot the ordered pairs 20, 60 and 30, 80 and 40, 100 and 50, 120 and 60, 140 Which function best represents the data in the scatter plot? y = 2x − 20 y = 2x + 20 y = x − 20 y = x + 20

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  1. anonymous
    • one year ago
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  2. ccswims
    • one year ago
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    well first, find the slope, y2 - y1/x2 - x1

  3. ccswims
    • one year ago
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    so ill give you this 120 - 60/50 - 20

  4. ccswims
    • one year ago
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    subtract that by yourself and tell me what you get

  5. anonymous
    • one year ago
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    60/30 thats what I got

  6. anonymous
    • one year ago
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    @ccswims

  7. ccswims
    • one year ago
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    ok, simplified it is 2/1. so, we now have the slope of our equation y = 2x + b. but we still need to find b (or where the y intersects.)

  8. anonymous
    • one year ago
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    Ok

  9. ccswims
    • one year ago
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    now, using our slope, we must change it to 1/2 because we are going backwords. So, do 60 divided by 0.5

  10. ccswims
    • one year ago
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    I mean MULTIPLY 60 by .5

  11. ccswims
    • one year ago
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    sorry, if you divided that would be wrong, multiply them

  12. anonymous
    • one year ago
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    lol ok

  13. anonymous
    • one year ago
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    its 30

  14. ccswims
    • one year ago
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    ok, so it is y = 2x + 30

  15. anonymous
    • one year ago
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    but my answers are y = 2x − 20 y = 2x + 20 y = x − 20 y = x + 20

  16. ccswims
    • one year ago
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    ok, go with y = 2x + 20. it cant be -20 because it is a positive y intersect, not a negative, and we know it is a slope of 2.

  17. anonymous
    • one year ago
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    ok

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