Odpowiedzi

2009-11-17T16:11:56+01:00
2x-2y= -3
x-y=1/*(-2)

2x-2y=-3
-2x+2y=-2

0=skreślone -5
2009-11-17T16:20:30+01:00
{2x-y=-3
{x=1+y

{2+2y-y=-3
{x=1+y

{y=-3-2
{x=1+y

{y=-5
{x=-4

2009-11-17T16:24:41+01:00
{2x-2y=-3
{x-y=1 /*(-2)


2x-2y=-3
-2x+2y=-2

y=-6/1
y=-6

2x-2(-6)=-3
y=-6

2x+12=-3
y=-6

2x=-3-12
y=-6

2x=-15/2
y=-6

x=-7,5
y=-6