Odpowiedzi

2009-09-06T14:54:39+02:00
{ x-y=5
{ 3x+4y=8

{ x=5+y
{ 3(5+y)+4y=8

15+3y+4y=8
15+7y=8
7y=8-15
7y=-7
y=-1

x=5+y
x=5+(-1)
x=4

{ y=-1
{ x=4
2009-09-06T14:56:52+02:00