Odpowiedzi

2010-02-24T15:11:07+01:00
X - duże paczki
y - małe paczki

3y + 4 = 2x
3y = x + 28 / -28
3y - 28 = x

3y + 4 = 2*(3y - 28)
3y = x + 28

3y + 4 = 6y - 56 / +56
3y = x + 28

3y + 60 = 6y / -3y
3y = x + 28

60 = 3y / :3
3y = x + 28

y = 20
3y = x + 28

3 * 20 = x + 28
60 = x + 28 / -28

x = 32
y = 20
2010-02-24T15:11:31+01:00
X- duża paczka
Y - mała paczka

2x - 4 = 3y
x + 28 = 3y

2x - 3y = 4 /* (-1)
x - 3y = - 28

-2x + 3y = 4
x - 3y = - 28
-x = - 32
x = 32

32 + 28= 3y ||| <=== x +28 = 3y
60 = 3y
20 = y

prosze ;]