Question

2\(3x-1)-3\(x-y)=1 4\(x-y)+3\(x+2y+=1 用加减法接二元一次方程组

Answer 1

代简2*(3x-1)-3*(x-y)=1得x+y=1 (1)

4*(x-y)+3*(x+2y)=1得7x+2y=1 (2)

(2)-(1)*2得5x=-1,从而得到x=-1/5,

代入（1）式得到y=6/5