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5x + 2y = 17 ⇔ 2y = -5x + 17 ⇔ 6y = -15x + 51 ............(2)
6y - 4z = 8 ⇔ 6y = 4z + 8 ....................(3)
Dari pers (3) dan (2)
4z + 8 = -15x + 51
15x + 4z = 43 ⇔ 105x + 28z = 301 ........................(4)
Dari pers. (1) dan (4)
32x - 28z = 48
105x + 28z = 301 +
137 x = 349 maka x = 349/137
2y = -5x + 17 ⇔ 2y = -1745/137 + 2329/137 ⇔ 2y = 584/137 ⇔ y = 292/137
6y = 4z + 8 ⇔ 4z = 6y - 8 ⇔ 4z = 1752/137 - 1096/137 ⇔ 4z = 656/137 ⇔ z = 164/137
Jadi y > z (jawaban B)