Question

方程组x-4y-1=0,X^2-5xy+6y^2=0

Answer 1

降阶法,

X^2-5xy+6y^2=(x-2y)(x-3y)=0,

所以x-2y=0或者x-3y=0,

即x=2y或x=3y,

分别代人 x-4y-1=0得

x=-1,y=-1/2或x=-3,y=-1.