1. The problem statement, all variables and given/known data The problem is tough to type out correctly. Pasting problem statement image http://postimg.org/image/a0r92a0wl/ http://postimg.org/image/a0r92a0wl/ 3. The attempt at a solution I just need to know how to proceed with the problem. Not the answer. This is the scan of my attempt. http://postimg.org/image/uun8gt2sz/ http://postimg.org/image/uun8gt2sz/ I stuck about how i eliminate the x and y terms. I thought replacing it with GP series sum would help but it unnecessarily introduces a restriction on x and y. Is the initial process in my worked out solution correct? if not what direction do you suggest ?