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atau bisa juga
A = -10
B = -12
rumus garis singgung
xx1 + yy1 + A (x+x1) + B (y+y1) +c = 0
x + 4y - 5 (x+1) - 6 (y+4) + 43 = 0
x + 4y - 5x - 5 - 6y - 24 + 43 = 0
x - 5x + 4y - 6y - 5 - 24 + 43 = 0
-4x - 2y + 14 = 0