y-x=30 y+1=3(x+1)
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y-x=30 y+1=3(x+1)
y-x=30 y+1=3(x+1)
y-x=30 y+1=3(x+1)
y=30+x
30+x+1=3(x+1)
30+x+1=3x+3
-2x=3-30-1
-2x=-28
x=14
y-x=30 (1)
y+1=3(x+1) (2)
(2)-(1),得：1+x=3(x+1)-30
x=14
将x=14带入（1）得：y=44
综上可得：方程组y-x=30 y+1=3(x+1)
的解为：x=14 y=44
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