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x² + y² + 6x + py - 91 = 0
(2)² + (5)² + 6(2) + 5p - 91 = 0
4 + 25 + 12 + 5p - 91 = 0
5p - 50 = 0
5p = 50
p = 50 / 5
p = 10
= 4 + 25 + 12 + 5p - 91= 0
41 + 5p = 91
5p = 91 - 41
5p = 50
p = 10
Jadi nilai P = 10