Odpowiedzi

2009-09-22T21:46:05+02:00
Układ równań
x = 2y
x = y + 18

2y = y + 18
y = 18

x = 2y = 36

x = 36
y = 18
2009-09-22T21:48:58+02:00
X = 1/2y
x = y - 18

x = 1/2y
1/2y = y - 18

x = 1/2y
- 1/2y = - 18 /: -1/2

x = 1/2y
y = 36

x = 18
y = 36
2009-09-22T21:54:34+02:00
X=y*2
x=y+18


y+18=y*2
y+18=2y
2y-y=18
y=18

x=18*2
x=36

x=36 i y=18