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2x + 3y -6 = 0 sejajar -1,5
2x+3y + k = 0 ( tulis lagi, kalau tegak lurus beda lagi)
2.-1 + 3.5 + k = 0 (masukin titiknya)
-2 + 15 + k = 0
13 + k = 0
k = -13
persamaan = 2x + 3y + k
= 2x + 3y - 13
btw kalau tegak lurus baru dibalik