Odpowiedzi

2009-11-19T17:35:34+01:00
2(x-1)+3(y-2)=5
2x - 2 + 3y - 6 = 5
2x = 13 - 3y / 2
x = 6,5 - 1,5y


3(x-y)-2(x-2)=7
3x -3y - 2x +4 = 7
x = 3 + 3y
2009-11-19T17:35:44+01:00
2(x-1)+3(y-2)=5
3(x-y)-2(x-2)=7

2x - 2 +3y - 5 = 5
3x - 3y - 2x +4 = 7
3y się skreśla

i juz masz tylko z jadna niewiadomą zadanie
1 5 1
2009-11-19T17:52:28+01:00
2(x-1)+3(y-2)=5
3(x-y)-2(x-2)=7

2x-2+3y-6=5
3x-3y-2x+4=7

2x+3y=13
x-3y=3

3x=16 /:3
x=5⅓

5⅓-3y=3
-3y= -1⅔
-3y=-⁵/₃ /×(-3)
9y=5 /:9

y=⁵/₉



1 5 1