Odpowiedzi

2009-11-17T16:09:31+01:00
{3x-2y-5=0
{x+y=5

{x=5-y
{3(5-y)-2y-5=0

{x=5-y
{15-3y-2y-5=0

{x=5-y
{10-5y=0

{x=5-y
{5y=10 I: 5

{x=5-y
{y=2

{x=5-2
{y=2

{x=3
{y=2
2009-11-17T16:09:55+01:00
3x-2-5=0
x+y=5

3x-7=0
x=5-y

3(5-y)-7=0
x=5-y

15-3y-7=0
x=5-y

-3y=-13 /:(-3)
x=5-y

y≈4,3
x=5-4,3

y≈4,3
x=0,7
1 1 1
2009-11-17T16:15:57+01:00
{3x-2y-5=0
{x+y=5

{3x-2y-5=0
{y=5-x

{3x-2(5-x)-5=0
{y=5-x

{3x-10+2x-5=0
{y=5-x

{5x=15
{y=5-x

{x=3
{y=5-3

{x=3
{y=2