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anonymous

  • one year ago

help please! :) How do I graph f(x)= 8.5x<=40 12.75(x-40) x>40

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  1. anonymous
    • one year ago
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    f(x)=12.75(x-40) x>40*** its a piecewise function!

  2. Loser66
    • one year ago
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    right?

  3. anonymous
    • one year ago
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    yup!

  4. Loser66
    • one year ago
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    so, just graph one by one

  5. anonymous
    • one year ago
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    wait oops

  6. anonymous
    • one year ago
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    i meant 8.5x x<=40

  7. Loser66
    • one year ago
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    ok|dw:1438830167577:dw|

  8. Loser66
    • one year ago
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    the first one: f(x) = 8.5x, x =0, f(0) =? x =1, f(1) =?

  9. anonymous
    • one year ago
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    f(0)=0 f(1)= 8.5

  10. Loser66
    • one year ago
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    one more, x = 40, f(40) =??

  11. anonymous
    • one year ago
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    340

  12. Loser66
    • one year ago
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    |dw:1438830315845:dw|

  13. Loser66
    • one year ago
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    34, not 340

  14. anonymous
    • one year ago
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    oh oops hahah thanks!

  15. Loser66
    • one year ago
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    The graph will stop there, at the point x =40, right? hence for the first piece, we have |dw:1438830483660:dw|

  16. anonymous
    • one year ago
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    wait i can't graph (40, 34) bc the y axis given only goes up to 16

  17. Loser66
    • one year ago
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    Ignore it, you need understand the concept before doing something else. Ok? Now, the second part, f(x) = 12.75(x-40) , if x =41, f(41) =??

  18. anonymous
    • one year ago
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    12.75

  19. Loser66
    • one year ago
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    one more, x =42, f(42) =

  20. anonymous
    • one year ago
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    25.5

  21. Loser66
    • one year ago
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    |dw:1438830723649:dw|

  22. Loser66
    • one year ago
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    and we take the value of f for x >40, right?, hence take this part |dw:1438830862744:dw|

  23. anonymous
    • one year ago
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    yeah i kind of get it! the restriction right?

  24. Loser66
    • one year ago
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    ok, now combine the two.

  25. Loser66
    • one year ago
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    |dw:1438830952038:dw|

  26. Loser66
    • one year ago
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    hence your graph is |dw:1438831013456:dw|

  27. Loser66
    • one year ago
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    got me?

  28. anonymous
    • one year ago
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    yeah i get it!

  29. Loser66
    • one year ago
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    Now, fix your given system.

  30. anonymous
    • one year ago
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    wait what do you mean

  31. Loser66
    • one year ago
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    It gives you the system is |dw:1438831085846:dw|

  32. Loser66
    • one year ago
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    you just re-label the system, instead of 1,2,you put it 5, 10, 15..... |dw:1438831239279:dw|

  33. anonymous
    • one year ago
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    yeah it already does it by 2's but im not sure if im supposed to relabel it but if i don't how would i show the restrictions

  34. Loser66
    • one year ago
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    just take the last graph I showed you|dw:1438831384266:dw|

  35. anonymous
    • one year ago
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    okay thank you so much!! :)

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