y=2x-1
代入
x^2-4y^2+x-3y-1=0
x^2-4(2x-1)+x-3(2x-1)-1=0
x^2-16x^2+16x-4+x-6x+3-1=0
15x^2-11x+2=0
(5x-2)(3x-1)=0
x=2/5,x=1/3
y=2x-1
所以x=2/5,y=-1/5或x=1/3,y=-1/3