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m = -2/-5 = 2/5
karena sejajar, maka m = 2/5
(i) m = -5/-2 = 5/2
(ii) m = -2/-2 = 2/5
(iii) m = -3/5 = -3/5
(iv) m = --4/10 = 2/5
maka, garis yg sejajar dgn 2x -5y + 15 = 0 adalah garis (ii) dan (iv)