Question

-3x-7y =-2
-2x+5y= -1

Answer 1

Resposta:

-3x-7y =-2  ==> 2 vezes  ==> -6x-14y=-4  (i)

-2x+5y= -1 ==> 3 vezes ==> -6x+15y=-3  (ii)

(i) -(ii)

0 -29y=-1   ==>y=1/29

-2x+5y=-1  ==> -2x+5 *(1/29) =-1

-2x +5/29=-1

-2x=-29/29 -5/29

-2x = -34/29

x=17/29

x=17/29   e   y=1/29