2(x+100)=(1-25%)y

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2(x+100)=(1-25%)y2(x+100)=(1-25%)y2(x+100)=(1-25%)y2(x+100)=3y/4=>y=8(x+100)/3=>x=t;y=8(t+100)/3;t任意

2(x+100)=(1-25%)y
2(x+100)=(1-25%)y

2(x+100)=(1-25%)y
2(x+100)=3y/4 => y=8(x+100)/3
=> x=t ;y=8(t+100)/3 ;t任意实数