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y=4/3x
y+b/ax
jadi, a=3 a²=9
b=4, b²=16
fokus (c,0)
c=5, c²=25
(pembuktian untuk c: c²=a²+b²->c²=9+16=25, c=5)
jadi, persamaannya adalah, x²/9-y²/16=1