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r = jarak P(2, -3) ke 3x - 4y +2 = 0
r = {3(2) -4(-3) +2} / (√(3²+4²)
r = (6+12+2)/(5)
r = 20/5
r = 4
pers ling (x-2)² +(y+3)² = 16
atau
x²- 4x + 4 + y²+6y+9 -16 = 0
x² +y² - 4x + 6y - 3 = 0