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2x + 3y + c = 0 --> koefisiennya dituker, kalau tegak lurus salah satu tandanya diubah (-2 jadi 2)
2 (-4) + 3(3) +c = 0 --> variablenya diganti pake titik
-8 + 9 + c = 0
c = -1
persamaan = 2x + 3y -1 =0
m =
m =
m1 x m2 = -1
x m2 = -1
m2 = -1 x
m2 =
Tinggal kita masukkan deh
y - y1 = m ( x - x1 )
y - 3 = ( x + 4 )
3y - 9 = -2x - 8
2x + 3y = -8 + 9
2x + 3y = 1 (1)
2x + 3y - 1 = 0 (2)
3y = -2x + 1 (3)