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m = -6/2 = -3
2x + 2y - 16x + 8y - 40 = 0
a = -1/2A = -1/2(-16) = 8
b = -1/2B = -1/2(8) = -4
r =
y-b = m(x-a) + r (√1 + m²) atau y-b = m(x-a) - r √1 + m²
y+4 = -3(x-8) + 2√30(√1 + 9) atau y+4 = -3(x-8) - 2√30(√1+9)
y+4 = -3x+24 + 2√30.√10 atau y+4 = -3x+24 - 2√30.√10
y+4 = -3x+24 + 2√40 atau y+4 = -3x+24 - 2√40
y+4 = -3x+24 + 4√10 atau y+4 = -3x+24 -4√10
y+4+3x-24+4√10=0 atau y+4+3x-24-4√10
y+3x+4-24+4√10=0 atau y+3x+4-24-4√10
y+3x-20+4√10=0 atau y+3x-20-4√10=0