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Koef. y × y = -4 × 5 = -20
3x - 4y - ( -3 - 20 ) = 0
3x - 4y + 23 = 0
3x-4y+5 = 0 sejajar titik -1, 5
3x-4y+k= 0 (tulis lagi..)
3.-1 -4.5 +k = 0 (masukin titiknya(
-3-20 +k = 0
-23 +k = 0
k = 23..
pers= 3x - 4y + 23 = 0
kalau cara cepet tegak lurus
4x+3y +k = 0 ( koefisien dibalik, salah satu tandanya diubah, -4 jadi 4)
4.-1 +3. 5 +k = 0
-4 + 15 +k =0
11+k = 0
k = -11
pers= 4x+3y-11= 0