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vishal--j

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f(x)=600sin(2π3(x−0.25))+1000 and f(x)=600sin(2π7(x))+500

How do I go about finding the points of intersections of the two graphs?

This was from a test I had recently and didn't do too well on,so any help would be much appreciated.

I started by equating the 2 equations but from there I got pretty stuck .

We covered a similar question in class except the values in the brackets in both sides could be set to a variable such as 'y'. Since I can't see a way to do that here I am pretty much stuck.

This is from a final year high school calculus class.

Thank you very much in advance.Sorry I posted this in the maths part of the forum first as I didn't realize there was this part of the forum.