Respostas

2013-09-17T09:34:14-03:00
{2x -7y = 4    *-3
{3x +5y= 37  *2

{-6x +21y = -12
{6x + 10y = 74
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0 x + 31 y = 62
 y = 62/31 
y = 2


{2x -7.2 = 4

{2x -14=4
 
2x= 4+14
x= 18/2
x= 9