calculer x et y

il y a rien ou koi !!!!!

exo 1:
ladaïna xy+3x+y=12
(x+1)(y+3)=15
(x+1,y+3) yantami ila {(1,15);(3,5);(5,3)}
(x,y)yantami ila {(0,12);(2,2);(4,0)}
exo 2 :
2xy+x+2y=54
(x+1)(2y+1)=55
(x+1,2y+1) yantami ila {(1,55);(5,11);(11,5);(55;1);(-1,-55);(-5,-11);(-11,-5);(-55;-1)}
(x,y)yantami ila {(0,27);(4,5);(10,2);(54,0);(-2,-28);(-6,-6);(-12,-3);(-56,-1)}

determiner x;yet z tel que :
sqrt(x)+sqrt(y-1)+sqrt(z-2)=(x+y+z)/2