Determine the following linear equations. 
 
\(\frac{x}{a} + \frac{y}{b} = 2\)    
 
\(ax - by = a^2 - b^2\)
 
\(x=\)
 
\(y=\)
Answer variants:
\(\frac{-2ab}{a+b}\)
\(b\)
\(\frac{-2ab}{a-b}\)
\(a\)