54 x + 3y = 3 2x – y = – 8 Jawab: = | 3 3 −8 −1 | | 1 3 2 −1 | = (3)(−1)−(3)(−8) (1)(−1)−(3)(2) = (−3)−(−24) −1−6 = 21 −7 = −3 = | 1 3 2 −8 | | 1 3 2 −1 | = (1)(−8)−(3)(2) (1)(−1)−(3)(2) = −8−6 −1−6 = −14 7 = −2 Jadi, penyelesaiannya x = –3 dan y = –2.
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