rozwiąz zadanie metodą przeciwnych wspułczynników
-x-y=-6
-x+y=2
-x - y = -6
-x + y = 2
---------------
-2x = -4
x = 2
-2 - y = -6
-y = -6 + 2
-y = -4
y = 4
______
-2x = -4 /:(-2)
-2-y = -6
-y = -6+2
-y = -4 /:(-1)
Spr.
-2-4 = -6
-2+4 = 2
-6 = -6
2 = 2 OK.
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-x - y = -6
-x + y = 2
---------------
-2x = -4
x = 2
-x - y = -6
-2 - y = -6
-y = -6 + 2
-y = -4
y = 4
x = 2
y = 4
-x-y=-6
-x+y=2
______
-2x = -4 /:(-2)
x = 2
-2-y = -6
-y = -6+2
-y = -4 /:(-1)
y = 4
Spr.
-x-y=-6
-x+y=2
-2-4 = -6
-2+4 = 2
-6 = -6
2 = 2 OK.