agillogly
Assume the graph of a function of the form y=ycos(k(xb)) is given below. Which of the following are possible values for a,k, and b?



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agillogly
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agillogly
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a a=4, k=1/2, b=pi/4
b a=2,k=4,b=pi/4
c a=4,k=2,b=pi/4
d a=4,k=2,and b=pi/4

dpaInc
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in your question, i'm assuming that second y is supposed to be an "a"....

agillogly
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I thought the same thing, but there is no a in the equation, which is part of why I can't figure it out.

dpaInc
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according to the choices, i'm pretty sure it is an "a" ...

dpaInc
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you can eliminate B

agillogly
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dpaInc
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since the peiod is pi, k=2 because period=2pi/k

dpaInc
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so your choices are either C or D....

agillogly
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So it depends on if b is negative or positive. I think its C?

dpaInc
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you're right...:)