x+y=44
x^2-y^2 = 528
===============

mmmm

x = 44-y

(44-y)^2 -y^2 = 528

1936 - 88y + y^2  -y^2  = 528

-88y = 528-1936
-88y = -1406
y = 15.97 something but that is wrong !!

:(?