Respuestas

2012-11-20T02:10:58+01:00

2x-y=-1


2x=-1+y


x=(-1+y)/2


x+3y=17


(-1+y)/2+3y=17


(-1+y+6y)/2=17


(-1+y+6y)=34


-1+7y=34

 

7y=34+1

 

Y=35/7

 

y=5

 

2x-y=-1

 

2x-5=-1

 

2x=-1+5

2x=4

 

x=4/2

 

x=2