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pers ling diubah
x² + y² + 5x - 6y - 33 = 0
(x + ⁵/₂)² + (y-3)² = (193/4)
titik (1, -3) pada lingkaran
pers. grs singgung di (x1,y1) --> (x1-a)(x-a) +(y1-b)(y-b) = r²
(1 +⁵/₂)(x + ⁵/₂) + (-3-3)(y-3) = 193/4
⁷/₂ (x + ⁵/₂) - 6(y-3) = 193/4 .....kalikan 4
14(x + ⁵/2) - 24(y-3) = 193
14x + 35 - 24y + 72 - 193 = 0
14x - 24y - 86 = 0 .....bagi 2
7x - 12y - 43 = 0
...