5y=14x-11
-495=56xy-31y^2
5y=14x-11
Решаем относительно x:
x=(5y+11)/14
-495=56*((5y+11)/14)*y-31y^2
-495+11y^2-44y=0
D=(-44)^2-4*11*(-495)=1936+21780=23716
y1=(154-(-44))/(2*11)=198/22=9
y2=(-154-(-44))/(2*11)=-110/22=-5
5y=14x-11
5*9=14x-11
56-14x=0
x=56/14
x1=4
5*(-5)=14x-11
-14-14x=0
x=-14/14
x2=-1