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m=y2-y1 / x2-x1
= 13 + 12 / -1 - 4
= 25 / -5 = -5
karna tegak lurus jadi dibalik, diubah tanda
-5 → 1/5
terus cari persamaan yang gradiennya 1/5
cara cari gradien dari persamaa ax + by = c
-a:b