Question

$1). left { {{ x^{2} -5xy+6 y^{2}=0 } atop { x^{2} + y^{2}=10 }} right. \ 2). left { {{ frac{4}{x+y+1}= frac{2}{x-y+1} } atop { frac{x-y-1}{-1}= frac{x+y+1}{3} }} right.$