Odpowiedzi

2009-04-26T10:49:31+02:00
X-y=-2
3x-y=x+1


x=-2+y
2x = 1+y

x=-2+y
2*(-2+y) = 1+ y

x=2+y
-4 + 2y= 1 +y

x=2+y
y= 5

x=7
y=5

x=2 + 5
y= -3

x= 7
y= 5