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anonymous

  • one year ago

Algebra!

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  1. anonymous
    • one year ago
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    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):

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  2. anonymous
    • one year ago
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    Which function best represents the data in the scatter plot? y = 2x − 20 y = 2x + 20 y = x − 20 y = x + 20

  3. anonymous
    • one year ago
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    I know is B or D. Leaning more towards B.

  4. anonymous
    • one year ago
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    take (20,60) and (50,120)

  5. anonymous
    • one year ago
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    Okay, hold up.

  6. anonymous
    • one year ago
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    120 - 60 --------- 50 - 20

  7. anonymous
    • one year ago
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    So your gradient is 2.

  8. anonymous
    • one year ago
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    60 --- = 2 30

  9. anonymous
    • one year ago
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    Yes.

  10. anonymous
    • one year ago
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    y=2x+c

  11. anonymous
    • one year ago
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    And, since it is a positive slope it must be, B y = 2x + 20

  12. anonymous
    • one year ago
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    now set y=60 and x=20 to find c

  13. anonymous
    • one year ago
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    no not neccessary, the +20 or -20 is the y intercept.

  14. anonymous
    • one year ago
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    negative slope is when you have a negative mx

  15. anonymous
    • one year ago
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    Ok, so, what do I do for Step 2?

  16. anonymous
    • one year ago
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    @saseal ?

  17. anonymous
    • one year ago
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    so after you set the value you should get 60=2(20)+c. solve for c.

  18. anonymous
    • one year ago
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    So your answer should be 20. Therefore, answer is y=2x+20.

  19. anonymous
    • one year ago
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    Radical!!!

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