Question

2元一次方程 2x+3y=1 3x-2Y=-9

Answer 1

2x+3y=1 .(1)

3x-2y=-9.(2)

(1)*2+(2)*3得

13x=-25

x=-25/13

代入(2)得

-75/13-2y=-9

2y=42/13

y=21/13

解得

x=-25/13

y=21/13