2x+y=5(1) x-3y=6
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2x+y=5(1) x-3y=6
2x+y=5(1) x-3y=6
2x+y=5(1) x-3y=6
2x+y=5 ①
x-3y=6
∴2x-6y=12②
①-②得7y=-7
y=-1
将y=-1代入①
得x=3
答:x=3 y=-1
2x+y=5…………(1)
x-3y=6 …………(2)
(2)×2,得:
2x-6y=12…………(3)
(1)-(3),得:
7y=-7
y=-1
代入(2),得:
x-3*(-1)=6
x+3=6
x=3
解为:
x=3
y=-1
x=3,y=-1
2X+y=5 ........1
x-3y=6 .........2
1*3+2得 7X=21 所以x=3 y=-1
x-3y=6
2x-6y=12
2x+y=5
-7y=7
y=-1
x=3
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