If we are given x such that 25^x - 9^y = 16 and 5^x - 3^y = 2, find x + y.
Notice that \(25^x - 9^y = (5^x + 3^y)(5^x - 3^y)\). Hope this gets you started.
It's pretty clear that $\boxed{x=1}$ works.
+1224 
