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x + y = 160.000
x - y = 30.000
(1 1)(x) = (160.000)
(1 -1)(y) = (30.000)
jawaban A
no 3)
2a + b - 3c = 7
3a - 2b + 0 = 8
0 + 4b - c = 7
(2 1 -3 ) (a) = (7)
(3 -2 0 )(b) (8)
(0 4 -1) (c) (7)
jawaban B