{x+4x=2 5 x-6y=1

{x+4x=2 5 x-6y=1
{x+4x=2 5 x-6y=1

{x+4x=2 5 x-6y=1
是x-4y=2 (1)
5x-6y=1 (2)
由(1)
x=4y+2
代入(2)
20y+8-6y=1
14y=-7
所以
y=-1/2
x=4y+2=0