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3x - y = 1
--------------- +
5x = 5
x = 1
Subtitusi x = 1
2 + y = 4
y = 2
Jadi, HP =(x,y) = (1,2)
3x-y=1
-----------+
5x=5
x=1
2x+y=4
2(1)+y=4
y=4-2
y=2
jadi HP (x,y)=(1,2)