2X-3Y=-10 6X+5Y=12

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2X-3Y=-106X+5Y=122X-3Y=-106X+5Y=122X-3Y=-106X+5Y=122X-3Y=-10(1)6X+5Y=12(2)(2)-(1)×35Y+9Y=12+3014Y=42

2X-3Y=-10 6X+5Y=12
2X-3Y=-10 6X+5Y=12

2X-3Y=-10 6X+5Y=12
2X-3Y=-10 (1)
6X+5Y=12 (2)
(2)-(1)×3
5Y+9Y=12+30
14Y=42
所以Y=3
X=(-10+3Y)/2=-1/2

x=-0.5
y=3

在第一个式子中X3 再用一式减二式得Y=2 X=-2

Y=3，X=-0.5

2X-3Y=-10 ①
6X+5Y=12 ②
②-①*3 得：y=3
代入① x=-(2/1)

x=-1/2,y=3

X等于1/2。。。。Y等于11/3。。。

2X-3Y=-10 A
6X+5Y=12 B
A两边同时*3 有6X-9Y=-30 C
B-C 有 14Y=42 得Y=3 代入A有 2X-9=-10 得X=-1/2=-0.5

2X-3Y=-10 转换成6X-9Y=-30
6X-9Y=-30 (1)
6X+5Y=12 (2)
(1)- (2) 求出Y=3 X=-0.5

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