Odpowiedzi

2010-02-21T13:49:53+01:00
2x-2y=7 | /2
4x+3y=21

x-y=3,5
4x+3y=21

x=y+3,5
4x+3y=21

x=y+3,5
4(y+3,5) +3y=21

x=y+3,5
4y+14+3y=21

x=y+3,5
7y=7 | /7

x=y+3,5
y=1

x=1+3,5
y=1

x=4,5
y=1





2010-02-21T13:52:48+01:00
{2x-2y=7/podzielić na 2
{4x+3y=21

x-y-3,5
4x+3y=21

x=3,5+y
4*(3,5+y)=21

x=3,5+y
14+4y=21

x=3,5+y
4y=21-14

x=3,5+y
4y=7/podzielić na 4

x=3,5+y
y=1,75

x=3,5+1,75
y=1,75

x=5,25
y=1,75
2010-02-21T14:10:24+01:00
2x=7+2y|/2
4x+3y=21

x=3,5+y
4(3,5+y)+3y=21

x=3,5+y
14+4y+3y=21

x=3,5+y
7y=7|/7

y=1
x=4,5