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pusat = (-A/2, -B/2) = (4, -3)
r = √(4² + (-3)² - C) = √(16 + 9 - 20) = √5
2y = -x + 1 ---> y = -(1/2)x + 1/2 ---> m = -1/2
tgk lurus m1 = -1/m = -1/(-1/2) = 2
y - b = m1(x - a) ± r√(1 + m1²)
y + 3 = 2(x - 4) ± √5√(1 + 2²)
y = 2x - 11 ± 5
PGS1 ---> y = 2x - 6
PGS2 ---> y = 2x - 16