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a.
x²+y² = 9
x² + (0)² = 9
x = ± 3
x = 3 atau x = -3
Titiknya (3,0) dan (-3,0)
b.
x² + y² = 16
x² = 16
x = ± 4
Titiknya (4,0) dan (-4,0)
c.
x²+ y²+ 4y = 0
x² + (0)² + 4(0) = 0
x²= 0
x = 0
Titiknya (0,0)
d.
x²+y²-2x-4y =0
X² + (0)² -2x -4(0) = 0
x² -2x = 0
x(x-2) = 0
x = 0 atau x= 2
Titiknya (0,0) atau (2,0)