2(x+1)-3(y-1)=10 2(x+1)+3(y-1)=30

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2(x+1)-3(y-1)=102(x+1)+3(y-1)=302(x+1)-3(y-1)=102(x+1)+3(y-1)=302(x+1)-3(y-1)=102(x+1)+3(y-1)=302(x+

2(x+1)-3(y-1)=10 2(x+1)+3(y-1)=30
2(x+1)-3(y-1)=10 2(x+1)+3(y-1)=30

2(x+1)-3(y-1)=10 2(x+1)+3(y-1)=30
2(x+1)-3(y-1)=10 ①
2(x+1)+3(y-1)=30 ②
② - ① ,可得
6(y-1) = 20
y-1=10/3
y=1+10/3 = 13/3
将 y=13/3 代入①式,可得
x=9
即x=9 ,y=13/3

x=9 y=23

2(x+1)-3(y-1)=10
2(x+1)+3(y-1)=30
两式相加 4(x+1)=40 x+1=10 x=9
x=9 代入 20-3(y-1)=10
3(y-1)=10
y=13/3

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