Odpowiedzi

2010-01-20T19:01:46+01:00
2x-y=-6
x-y=-3

-y=-6-2x\*(-1)
y=6+2x

x-y=-3
x-(6+2x)=-3
x-6-2x=-3
-3x-6=-3
-3x=3\/(-3)
x=-1

x-y=-3
-1+y=-3
y=-2

2010-01-20T19:04:23+01:00
2x-y=-6
x-y=-3

-y=-6-2x\*(-1)
y=6+2x

x-y=-3
x-(6+2x)=-3
x-6-2x=-3
-3x-6=-3
-3x=3\/(-3)
x=-1

x-y=-3
-1+y=-3
y=-2