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URGENT !! Ration of relative abundances

A mass spectrum of a sample of indium showed two peaks at m/z = 113 and m/z = 115. The relative atomic mass of this sample of indium is 114.5
Use these data to calculate the ratio of the relative abundances of the two isotopes.

How do you work this out ?

I understand : 113x + 115y divided by x+y= 114.5

Where do i go from here ? Thank you!
(edited 10 years ago)
113x + 115y = 114.5

x + y = 1

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