Odpowiedzi

2010-03-12T17:25:49+01:00
2x - y = 6 /* -1
2x - 3y = - 2

|-2x+y = -6
+|2x - 3y = -2

-2y = - 8/ :-2
y = 4

2x - y = 6
2x - 4 = 6
2x = 6+4
2x = 10/:2
x = 5

2010-03-12T17:26:57+01:00
2x-y=6
2x-3y=-2

y=2x-6
2x-3(2x-6)=-2
2x-6x+18=-2
-4x=-2-18
-4x=-20
x=-20:-4
x=5

y=2×5-6=10-6=4
to była metoda podstawiania

2]
2x-y=6
2x-3y=-2/×(-1)

2x-y=6
-2x+3y=2
2y=8
y=8:2
y=4
2x-4=6
2x=6+4
2x=10
x=10:2
x=5