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3x+y = 7
-3x+9y = -27
3x+y=7
dodajesz równania do siebie, x się wyzerują
10y = -20
y = -2
3x-2=7
3x=9
x=3
b)
2x+y=1 ==========/*2
x-2y=8
4x+2y=2
x-2y = 8
5x =10
x=2
2-2y=8
-2y=6
y=-3