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anonymous

  • one year ago

if f(2)=5 and f(-1)=-3, find a and b in the function f(x)=ax+b

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  1. dan815
    • one year ago
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    they gave u 2 points

  2. dan815
    • one year ago
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    (2,5) and (-1,-3)

  3. dan815
    • one year ago
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    can you find the slope given these 2 points?

  4. dan815
    • one year ago
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    slope is the change in y per every change in x

  5. dan815
    • one year ago
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    for the points (2,5) and (-1,-3) look at how the y changes and how the x changed y from 5 to -3 x from 2 to -1

  6. anonymous
    • one year ago
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    the slope would be -2 /-3

  7. dan815
    • one year ago
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    y went down -8 x went down -3 -8/-3 = 8/3

  8. dan815
    • one year ago
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    remember from 5 to -3 not 5 to 3

  9. dan815
    • one year ago
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    plug in your slope and one of those points and see what b has to be

  10. anonymous
    • one year ago
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    oh yes i got -8/-3

  11. dan815
    • one year ago
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    f(x)=ax+b f(x)=8/3x+b pick one of the points (2,5) 5=8/3*(2)+b b=?

  12. dan815
    • one year ago
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    f(x) is another way to say y

  13. dan815
    • one year ago
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    y=8/3x+b we are given point (2,5)<---- x,y value in that order so we can plug that in for x,y 5=8/3(2)+b so we can see what b has to be so that this equation is satisfied

  14. anonymous
    • one year ago
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    i got -1/3

  15. dan815
    • one year ago
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    yes

  16. anonymous
    • one year ago
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    thank you so much, i appreciate it

  17. dan815
    • one year ago
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    okay sure thing :)

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