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y = -(3x+k)/4
gradien m = -3/4
x²+y² -4x +6y -12 =0
(x -2)² -4 + (y +3)² -9 -12 = 0
(x - 2)² + (y+3)² =25
pusat (2, -3) r=5
persamaan garis singgung lingkaran
y - b = m (x -a) + r√(1+m²)
y +3 = -3/4 (x - 2) + 5√(1 + 9/16)
y +3 = -3/4(x-2)+ 5(5/4)
y + 3 = -3/4(x-2) + 25/4...............dikalikan 4 biar gak pecahan
4y +12 = -3(x-2) + 25
4y +3x +12 -6 + 25 = 0
pers 1 ≡ 4y +3x + 6+25 =0
4y +3x +31 =0
k = 31
pers2 ≡ 4y +3x +6 -25 = 0
4y +3x -19 = 0
k = -19