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Math Help - I am stuck on graphing a sine function, please help!

  1. #1
    s3a
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    I am stuck on graphing a sine function, please help!

    I'm trying to graph a sine function and I have five points. I transform them using the parameters of the rule I'm given but I don't have enough coordinates in order to draw the curve properly. Does anybody know how I can create more coordinates by using the ones I already have (I have 5) so that I can graph it?

    Any help would be greatly appreciated!
    Thanks in advance!
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  2. #2
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    e^(i*pi)'s Avatar
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    Quote Originally Posted by s3a View Post
    I'm trying to graph a sine function and I have five points. I transform them using the parameters of the rule I'm given but I don't have enough coordinates in order to draw the curve properly. Does anybody know how I can create more coordinates by using the ones I already have (I have 5) so that I can graph it?

    Any help would be greatly appreciated!
    Thanks in advance!
    What is the function you're trying to plot? For example y = sin(x) goes through (-\pi, 0) (-\frac{\pi}{2}, -1) (0,0) (\frac{\pi}{2}, 1) (\pi, 0)

    if you have y=sin(x+h) then all your points would move h to the left on the x axis
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  3. #3
    s3a
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    Quote Originally Posted by e^(i*pi) View Post
    What is the function you're trying to plot? For example y = sin(x) goes through (-\pi, 0) (-\frac{\pi}{2}, -1) (0,0) (\frac{\pi}{2}, 1) (\pi, 0)

    if you have y=sin(x+h) then all your points would move h to the left on the x axis
    The rule is:
    f(x) = 5 sin (-πx/4) - 3

    I got the following points by doing (x/b + h, ay + k):

    (0,-3)
    (-2,2)
    (-4,-3)
    (-6,-8)
    (-8,-3)
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  4. #4
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    Just remembering this myself, so maybe I won't be of much help but I will try!


    f(x) = 5 sin (-πx/4) - 3


    I believe that 5 at the beginning can be used as the slope (or 5/1). I think this is true because of the form y = mx + b.

    y = f(x)
    m = 5/1
    x = sin(-nx/4)
    b = -3

    m is a slope.


    Using the slope you can take a point and add 5 to the y value, and 1 to the x value. This is because a slope is arranged in rise over run form.

    5(rise) / 1 (run)





    Well... this could be completely wrong but if you have an answer sheet that you can check your answer on it's a worth a shot to see if it is correct. However, if you don't have an answer sheet, you should probably wait for someone that knows for certain.
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