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subtitusi ke persamaan ellips menjadi
(y+3)²/9 + (x-1)²/4 =1
(2x-c+3)²/9 +(x-1)²/4=1
terjadi perpotongan jika D ≥ 0
sehingga akan diperoleh nilai c
y = 2x-5
m = 2
Sejajarnya, m' = 2
a = 3, b = 2
Eplis vertikal
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