{4x+3y=1,2x+y=2 ｛2x+3y=2,3x-2y=3

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{4x+3y=1,2x+y=2 ｛2x+3y=2,3x-2y=3
{4x+3y=1,2x+y=2 ｛2x+3y=2,3x-2y=3

{4x+3y=1,2x+y=2 ｛2x+3y=2,3x-2y=3
4x+3y=1 ①
2x+y=2 ②
→ ②式乘以2 →4x+2y=4③
联立 4x+3y=1 ①
4x+2y=4③
①-③ → y=1-4= -3
将y= -3 代入① 4x +3乘以 -3 =1→4x=10→x=5/2
{x=5/2 y= -3
2x+3y=2①
3x-2y=3②
①乘以3 ②乘以2
→ 6x+9y=6③
6x-4y=6 ④
③-④ →13y=0 →y=0
y=0代入① →2x+0=2→x=1
{ x=1 y=0
很详细了

Y;4 X;-1 X;1Y;0

1)x=2.5,y=-3
2)x=1,y=o

方法一：代入法
由（2）式得：y=2-2x (3)
将（3）代入（1）：4x+3(2-2x)=1 得x=2.5
将x=2.5代入（3）：得y=-3
方法二：消元法
（2）乘以2得：4x+2y=4(3)
(1)-(3)得：y=-3
将y=-3代入（2）得：x=2 .5

x=2.5 y=-3
x=1 y=0

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