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Math Help - Sinusodial Equations

  1. #1
    Newbie
    Joined
    Sep 2009
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    3

    Sinusodial Equations

    I am having trouble coming up with this equation:
    Max: 12,000 Min: 6,500 P=10
    I know y=a sin(bx+c)+d
    a= 12000-6500/2 = 2750
    d= 12000+6500/2 = 9250
    b= 2pie/10=pie/5
    How do I find c?
    Is it necessary in this equation?
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  2. #2
    Junior Member
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    Sep 2009
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    c is only there is the sin graph is moved left or right

    a regular sin graph (without a c value) passes through the origin (0,0)
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  3. #3
    Newbie
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    Sep 2009
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    Yes, but..

    So when finding the sinusodial equation, should I put 0 in the c position? Or should I leave it out all together?
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  4. #4
    Junior Member
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    Sep 2009
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    yep leave it 0
    so just solve, now for
    y=a sin(bx)+d
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