Question

Решите систему уравнений
{x=y-2
{xy-y=10

Answer 1

left { {{y=x+2} atop {x(x+2)-x-2-10=0}} right. left { {{y=x+2} atop {x^2+x-12=0}} right. 
x^2+x-12=0
D=1+48=49
x1=-4 
x2=3
 left { {{ left { {{y1=2-2} atop {x1=-4}} right. } atop { left { {{y2=5} atop {x2=3}} right. }} right.