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2x + 3y - 1 = 0 => m = -a/b = -2/3
persamaan garis singgung
(y - 2) = m(x - 4) ± r√(m^2 + 1)
y - 2 = -2/3 (x - 4) ± √13 √(4/9 +1)
y - 2 = -2/3 x + 8/3 ± √13 √(13/9)
y - 2 = -2/3 x + 8/3 ± 13/3 ....... kali 3
3y - 6 = -2x + 8 ± 13
2x + 3y - 14 ± 13 = 0
2x + 3y - 1 = 0 atau 2x + 3y - 27 = 0