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kalikan masing masing matriknya
3x + y + y = 6 --> 3x + 2y = 6
4x+2y + 2x + 3y = 12 --> 6x + 5y= 12
.
eliminasikan
3x+2y=6 ......(X2)
6x+5y=12.
......
6x+4y=12
6x+5y=12
....(-)
-y = 0
y = 0 --> 3x +2y = 6
3x = 6-2y
3x = 6
x = 2
.
x-y = 2 - 0
x-y = 2