Respuestas

2012-07-09T03:34:26+02:00

a) -6x+3y=9   -->  3(-2x+y)=3*3 -->  y=3+2x

 

b) 12x-6y=18  --> 6(2x-y)=6*3 --> y=2x-3

2012-07-09T03:34:28+02:00

metodo de igualacion:

y= [18 +(-12)x].(-1/6)

y=(9+6x).1/3

 

[18 +(-12)x].(-1/6) = (9+6x).1/3

18.(-1/6) + (-12)x.(-1/6) = 9.1/3 + 6x.1/3

-3 + 2x = 3 + 2x

-3 +[2x +(-2x)] = 3 + 2x + (-2)x

-3 + 0 = 3 + 0

-3 = 3