Ответы и объяснения

2013-05-18T07:41:29+00:00

x+100=2(y-100)

6(x-10)=y+10

x+100=2y-200

6x-60=y+10

y=6x-70

x+100=2(6x-70)-200

x+100=12x-140-200

11x=440

x=40

y=6*40-70=240-70=170

2013-05-18T12:52:37+00:00

x+100=2(y-100)

6(x-10)=y+10

 

6(x-10)=y+10

6x-70-y=0

y=6x-70

 

x+100=2(y-100)

x+300-2y=0

x+300-2*(6x-70)=0

x+300-12x+140=0

-11x+440=0

x=440/11

x=40

 

6x-70-y=0

6*40-70-y=0

240-70-y=0

y=170