用加减消元法解:3(x-1)=y+5,5(y-1)=3(x+5)详细点!
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用加减消元法解:3(x-1)=y+5,5(y-1)=3(x+5)详细点!用加减消元法解:3(x-1)=y+5,5(y-1)=3(x+5)详细点!用加减消元法解:3(x-1)=y+5,5(y-1)=3(
用加减消元法解:3(x-1)=y+5,5(y-1)=3(x+5)详细点!
用加减消元法解:3(x-1)=y+5,5(y-1)=3(x+5)详细点!
用加减消元法解:3(x-1)=y+5,5(y-1)=3(x+5)详细点!
(x-1)=y+5 ①
5(y-1)=3(x+5)①
先化简①:
3(x-1)=y+5
3x-3=y+5
3x-y=5+3
3x-y=8 ③
再化简②:
5(y-1)=3(x+5)
5y-5=3x+15
5y-3x=15+5
5y-3x=20 ④
③ + ④ 得:
3x-y+5y-3x =8+20
4y=28
y=7
把y=7 代③得:3x-7=8
解得x= 5
所以x=5 y=7 是原方程组的解
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