• PERSAMAAN LINGKARAN
L : x² + y² + 4x - 2y - 27 = 0
D(2, -3)
Maka persamaan lingkarannya.
x₁x + y₁y + A/2 (x + x₁) + B/2 (y + y₁) + C = 0
2x + (-3)y + 4/2 (x + 2) + (-2/2) (y + (-3) + (-27) = 0
2x - 3y + 2(x + 2) - 1(y - 3) - 27 = 0
2x - 3y + 2x + 4 - y + 3 - 27 = 0
4x - 4y - 20 = 0
Maka garis tersebut adalah g : 4x - 4y - 20 = 0.
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• PERSAMAAN LINGKARAN
L : x² + y² + 4x - 2y - 27 = 0
D(2, -3)
Maka persamaan lingkarannya.
x₁x + y₁y + A/2 (x + x₁) + B/2 (y + y₁) + C = 0
2x + (-3)y + 4/2 (x + 2) + (-2/2) (y + (-3) + (-27) = 0
2x - 3y + 2(x + 2) - 1(y - 3) - 27 = 0
2x - 3y + 2x + 4 - y + 3 - 27 = 0
4x - 4y - 20 = 0
Maka garis tersebut adalah g : 4x - 4y - 20 = 0.