Odpowiedzi

2010-01-11T19:06:58+01:00
A)
x-y=3
-5x + 10y = -10
x=3+y
-5(3+y) +10y = -10
x=3+y
-15 - 5y + 10y = -10
x=3+y
10y = -10
x=3+y
y = -1
x=2