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2009-09-06T13:55:45+02:00
{ 2x-3y= -5
{-x+5y=6 /*2

{2x-3y= -5
{-2x +10x=12
___________

7y=7 /:7
y=1

2x-3= -5
2x= -2
x=-1

{x=-1
{y=1
2009-09-06T13:56:32+02:00
{2x-3y=-5
{-x+5y=6 /*2

{2x-3y=-5
{-2x+10y=12

7y=7 /:7
y=1

2x-3*1=-5
2x=-5+3
2x=-2 /:2
x=-1
2009-09-06T14:07:47+02:00
{ 2x - 3y = -5 / *5
{ -x + 5y = 6 / *3

{ 10x - 15y = -25
{ -3x + 15y = 18

7x = -7 / :7
x = -1

2* (-1) - 3y = -5
-2 - 3y = -5
-3y = -5 + 2
-3y = -3 / (-3)
y = 1